Connecting two buildings across a parking lot, linking a remote warehouse to a corporate network, or delivering broadband to a rural property without trenching conduit — these are problems that point to point wireless solves cleanly and cost-effectively. A dedicated radio link between two fixed endpoints can deliver throughput in the hundreds of megabits to multiple gigabits per second, often at a fraction of the cost of buried fiber and with installation measured in hours rather than weeks.
This guide covers everything required to plan, deploy, and maintain a point to point wireless link: the underlying technology, frequency band selection, line of sight requirements, link budget calculations, site survey methodology, antenna alignment, and weatherproofing.
What Is Point to Point Wireless?
Point to point wireless is a dedicated radio frequency link that connects exactly two endpoints. Each end uses a radio transceiver and an antenna, and the two units communicate exclusively with each other over a defined frequency channel. The result is a wireless bridge: a transparent Layer 2 connection that passes Ethernet traffic between two network segments as if a physical cable connected them.
This architecture differs from general-purpose Wi-Fi in several ways:
- Dedicated spectrum use: The link is not shared with client devices. All available channel capacity is reserved for the bridge.
- Directional antennas: P2P radios use highly directional antennas to focus energy toward the remote endpoint, improving range and reducing interference.
- Fixed endpoints: Both radios are mounted in permanent or semi-permanent positions aimed at each other, rather than associating dynamically.
Wireless Bridge vs. Wi-Fi Extender or Repeater
A Wi-Fi extender receives a wireless signal and rebroadcasts it, creating a new network segment, roughly doubling latency, and cutting available throughput approximately in half because the radio must receive and retransmit on the same channel. A wireless bridge creates a transparent Layer 2 connection. Devices on either side see each other as if connected to the same switched network — no rebroadcast penalty, no new network segment. Latency on a P2P bridge is typically 1–5 ms; a repeater chain adds 10–30 ms per hop.
Point to Point vs. Point to Multipoint
Point to point (P2P) links dedicate the entire link capacity to one remote site. Point to multipoint (P2MP) architecture uses a single base station to serve multiple remote sites simultaneously, sharing capacity across all of them. P2MP is more efficient when connecting five or more remote locations to a central hub, but each individual link receives a fraction of total capacity. For two locations requiring maximum throughput between them, P2P is almost always the right choice.
Key Terminology
- Backhaul: The segment of a network that carries aggregated traffic from edge locations back to a core or upstream connection.
- Throughput: Actual data transfer rate achieved under real conditions, distinct from the theoretical maximum modulation rate.
- RSSI (Received Signal Strength Indicator): A measurement of received signal power level, typically expressed in dBm.
- Link budget: A calculation accounting for all gains and losses in a radio link to determine whether adequate signal margin exists.
Common Use Cases
Campus and Building-to-Building Connectivity
The most common enterprise application is connecting two buildings on the same campus. Trenching fiber between two buildings can cost $15,000–$50,000 depending on surface type and local labor rates. A P2P wireless link covering the same path typically costs $500–$3,000 in equipment plus a few hours of installation labor. At distances under 1 km with clear line of sight, a 5 GHz or 60 GHz link can deliver 1 Gbps or more.
Security Camera Backhaul
Remote surveillance cameras at parking lots, gatehouses, or construction sites often cannot be cabled economically. A P2P wireless link carries video back to a recorder or NVR on the main network. Four 4K cameras at 8 Mbps each require only 32 Mbps of sustained throughput — well within the capability of entry-level P2P equipment.
Rural Broadband Last-Mile Delivery
Wireless internet service providers (WISPs) use P2P links to deliver broadband to rural properties where fiber infrastructure does not exist. A tower-to-premises link covering 5–15 km using licensed or unlicensed 5 GHz radio can deliver 50–300 Mbps to a single subscriber. For context on how this fits into the broader connectivity landscape, see our overview of what is fixed wireless internet.
Temporary Event Networking
Festivals, construction sites, and outdoor events require temporary high-speed connectivity deployable in hours. P2P links on unlicensed 5 GHz bands serve this role well, with setup times of 30–60 minutes for experienced installers.
Industrial and Remote Facility Connectivity
Oil fields, mining operations, and remote pump stations routinely sit kilometers from the nearest network infrastructure. A P2P link rated for industrial temperature ranges (-40°C to +60°C) can carry SCADA data, voice, and video over distances of 30+ km using licensed microwave bands.
How Point to Point Wireless Works
Radio Frequency Transmission and Modulation
A P2P radio converts digital data into a radio frequency signal using a modulation scheme. Modern P2P equipment uses OFDM (Orthogonal Frequency Division Multiplexing), which splits the channel into dozens of subcarriers and transmits data across all of them simultaneously. Higher-order modulation schemes like 256-QAM or 1024-QAM encode more bits per symbol, increasing throughput — but they require a stronger, cleaner signal to decode reliably.
MIMO (Multiple Input Multiple Output) technology uses multiple antennas to transmit independent data streams simultaneously, multiplying throughput without requiring additional spectrum. A 2×2 MIMO radio theoretically doubles throughput compared to a single-stream radio on the same channel width.
Channel Width, EIRP, and Throughput
Channel width determines how much spectrum the link occupies. A 40 MHz channel carries roughly twice the data of a 20 MHz channel; an 80 MHz channel doubles it again. Wider channels are more susceptible to interference and may not be available in congested environments.
EIRP (Effective Isotropic Radiated Power) is the total power radiated by the antenna system, combining transmit power and antenna gain while accounting for cable losses. The FCC sets EIRP limits by frequency band and antenna type. Exceeding these limits is illegal and can cause interference across wide areas.
Throughput scales with signal quality. As signal degrades — due to distance, weather, or interference — the radio automatically steps down to a more robust but lower-throughput modulation scheme. A link rated at 500 Mbps at -60 dBm might deliver only 100 Mbps at -75 dBm.
Line of Sight, Fresnel Zone, and Link Budget
True Line of Sight Requirements
“Line of sight” in RF engineering means more than a clear visual path. Radio waves require a clear Fresnel zone — an elliptical volume of space around the direct path — to propagate without significant loss. Objects within the Fresnel zone that are not visible from ground level (trees, rooftops, terrain undulations) can cause diffraction losses that degrade the link.
The Fresnel Zone: Why 60% Clearance Is the Standard
The Fresnel zone is an ellipse with the two antennas at its foci. The radius of the first Fresnel zone at the midpoint of a link is:
r = 17.3 × √(d / (4 × f))
Where r is in meters, d is total path length in kilometers, and f is frequency in GHz.
For a 1 km link at 5.8 GHz, the first Fresnel zone radius at the midpoint is approximately 5.5 meters. Any obstruction within that radius at the path midpoint causes measurable signal loss.
RF engineering practice recommends maintaining at least 60% clearance of the first Fresnel zone. Violating this threshold introduces Fresnel zone loss on top of free-space path loss — typically 3–10 dB of additional attenuation.
Pro tip: Use Google Earth’s elevation profile tool or dedicated RF planning software (such as Radio Mobile or vendor-specific path planners) to model the Fresnel zone before visiting the site. A 20-minute desktop survey can save hours of troubleshooting after installation.
Link Budget Fundamentals
A link budget accounts for all signal gains and losses from transmitter to receiver:
- Transmit power (dBm): The output power of the radio.
- Cable/connector losses (dB): At 5.8 GHz, low-quality RG58 cable loses approximately 1.5 dB per meter.
- Antenna gain (dBi): Directional antennas focus energy in the desired direction. A 30 dBi dish antenna provides substantial gain.
- Free-space path loss (dB): At 5.8 GHz over 1 km, free-space path loss is approximately 107 dB.
- Receiver sensitivity (dBm): The minimum signal level the radio can decode at a given modulation rate.
- Fade margin: The buffer between received signal level and receiver sensitivity.
Recommended minimum fade margin: 15–20 dB for a reliable outdoor link. Links with less than 10 dB of fade margin will experience frequent dropouts during rain, humidity changes, or minor atmospheric variations.
Common mistake: Calculating a link budget using the radio’s maximum modulation sensitivity rather than the sensitivity at the modulation rate required for your target throughput. A radio may have -95 dBm sensitivity at the lowest modulation rate but only -73 dBm at 256-QAM. Budget for the modulation rate you actually need.
NLOS Solutions
True non-line-of-sight (NLOS) links — where there is no visual path between endpoints — require specialized equipment or techniques. Sub-GHz frequencies (900 MHz) diffract around obstacles more effectively than 5 GHz but offer much lower throughput (typically under 50 Mbps). Some vendors offer NLOS-capable 5 GHz radios that use multipath propagation, but performance is significantly reduced compared to a clear LOS link. For most enterprise applications, investing in taller mounting structures to achieve LOS is more reliable than relying on NLOS propagation.
Frequency Band Comparison: 2.4 GHz vs. 5 GHz vs. 6 GHz vs. 60 GHz
Choosing the right frequency band is one of the most consequential decisions in a P2P deployment. Each band involves trade-offs between range, throughput, interference susceptibility, and regulatory complexity.
Comparison Table
| Criteria | 2.4 GHz | 5 GHz | 6 GHz | 60 GHz |
|---|---|---|---|---|
| Typical Max Range | 15+ km | 10–15 km | 5–10 km | 500 m–2 km |
| Max Throughput | ~300 Mbps | ~1.7 Gbps | ~3.5 Gbps | 1–10 Gbps |
| Interference Risk | Very High | Moderate | Low (emerging) | Very Low |
| Regulatory | Unlicensed (ISM) | Unlicensed (U-NII) | Unlicensed (AFC required) | Unlicensed (60 GHz ISM) |
| Fresnel Zone Size | Large | Medium | Medium-Small | Very Small |
| Rain/Fog Sensitivity | Low | Low | Low | Moderate |
| Ideal Use Case | Long range, low throughput | General purpose, medium range | High throughput, medium range | Gigabit short range |
Decision Framework
- Distance > 10 km, throughput < 100 Mbps: Use licensed microwave (11 GHz, 18 GHz) or 2.4 GHz unlicensed.
- Distance 500 m–10 km, throughput 100 Mbps–1 Gbps: Use 5 GHz unlicensed.
- Distance < 500 m, throughput > 1 Gbps: Use 60 GHz.
- Heavy 5 GHz interference (dense urban, industrial): Consider 6 GHz (where AFC-based access is available) or licensed microwave.
- Regulatory simplicity is a priority: 5 GHz remains the most broadly supported unlicensed band globally.
The 6 GHz band, opened by the FCC in 2020, offers 1,200 MHz of additional spectrum with far less incumbent interference than 2.4 GHz or 5 GHz. Standard-power outdoor use requires Automated Frequency Coordination (AFC) approval, adding operational complexity. For deployments where that complexity is manageable, 6 GHz delivers a meaningful step up in throughput and interference resilience.
For deployments requiring guaranteed performance and interference protection, licensed microwave bands (6 GHz, 11 GHz, 18 GHz, 23 GHz) provide coordinated spectrum with regulatory interference protection — at the cost of licensing fees and coordination time.
Site Survey, Antenna Alignment, and Installation
Site Survey Methodology
A proper site survey is the foundation of a reliable P2P link. Skipping it is the single most common cause of underperforming installations.
Desktop survey first:
- Use Google Earth to plot both endpoints and measure the exact path distance.
- Enable the elevation profile tool to identify terrain obstructions.
- Calculate the Fresnel zone radius at the midpoint and compare it to the elevation profile.
- Identify any trees, buildings, or structures within the Fresnel zone.
- Document antenna height requirements at each end to achieve 60% Fresnel zone clearance.
Physical site survey:
- Visit both sites and confirm mounting locations match the desktop plan.
- Assess structural integrity of mounting surfaces (rooftops, walls, poles).
- Identify cable routing paths from antenna to network equipment.
- Check for nearby RF sources that could cause co-channel interference.
- Document power availability at each mounting location.
Pro tip: Bring a spectrum analyzer or a laptop with a USB Wi-Fi adapter and spectrum analysis software to the physical site survey. A 5-minute spectrum scan at each end will reveal whether the planned frequency channel is congested before equipment is ordered.
Mounting Best Practices
Pole vs. wall mount: Pole mounts on rooftops or standalone masts provide the most flexibility for height adjustment and antenna orientation. Wall mounts are faster to install but constrain the antenna’s vertical aiming range.
Wind load: Dish antennas with large apertures act as wind sails. A 60 cm dish can experience 150+ Newtons of force in a 100 km/h wind. Verify that the mounting structure and anchor points are rated for the expected wind load in the installation region. Manufacturers publish wind load specifications in their datasheets — use them.
Grounding: Every outdoor radio installation requires proper grounding. Run a bonding conductor from the radio mounting hardware to the building’s grounding electrode system. Install surge protection modules on the Ethernet cable where it enters the building. Lightning-induced surges destroy unprotected equipment.
Antenna Alignment Process
Proper alignment is the difference between a link running at -58 dBm and one running at -72 dBm — a 14 dB difference that translates directly into throughput and reliability.
Step-by-step alignment procedure:
- Mount both antennas at the correct heights determined by the site survey.
- Aim both antennas visually at the far end using a compass bearing calculated from path coordinates.
- Power on both radios and establish a preliminary association.
- Access the radio’s signal strength display (most modern radios have a web GUI with a live RSSI readout or an audible alignment tone).
- Sweep the azimuth (horizontal) slowly — approximately 2–3 degrees per second — on one end while monitoring RSSI at the other. Identify the peak RSSI position.
- Lock the azimuth at peak and repeat the sweep for elevation (vertical).
- Tighten mounting hardware at the peak position and verify RSSI does not drop more than 1–2 dB during tightening.
- Repeat the process at the far end.
- Document final RSSI, noise floor, and SNR values for baseline records.
Common mistake: Aligning only one end of the link. Both antennas must be independently aligned to the far end. Aligning only the near end will leave 3–8 dB of signal unrealized.
Weatherproofing and Cable Management
- Apply self-amalgamating tape over all outdoor RF connector joints, starting from below the connector and wrapping upward to prevent water ingress.
- Form a drip loop in the Ethernet cable below the radio before it enters the conduit or building penetration, so water runs off the cable rather than following it inside.
- Use outdoor-rated shielded Cat6 or Cat6A cable for PoE runs. Unshielded cable in outdoor conduit exposed to lightning-induced ground potential differences will fail.
- Seal all conduit penetrations into buildings with fire-rated foam or conduit sealant to prevent moisture and pest ingress.
- Inspect connector weatherproofing annually in high-UV or coastal environments where tape degrades faster.
How Far Can Point to Point Wireless Reach?
Range is a function of frequency, antenna gain, transmit power, receiver sensitivity, and the throughput required at the far end. Marketing claims of “up to X kilometers” are typically measured at the lowest modulation rate, which may deliver only 5–10 Mbps.
Realistic Range Benchmarks by Band
| Frequency | Realistic Range (Unlicensed) | Throughput at Max Range |
|---|---|---|
| 2.4 GHz | 15–25 km | 10–50 Mbps |
| 5 GHz | 5–15 km | 50–300 Mbps |
| 6 GHz | 3–8 km | 200–800 Mbps |
| 60 GHz | 0.1–1.5 km | 1–5 Gbps |
| Licensed Microwave (11–23 GHz) | 10–50 km | 100 Mbps–1 Gbps |
Real-world example: A 5 GHz P2P link using 30 dBi dish antennas, 27 dBm transmit power, and a receiver sensitivity of -90 dBm at the lowest modulation rate has a theoretical maximum range exceeding 40 km in free space. In practice, Fresnel zone obstruction, atmospheric effects, and the need to maintain throughput above 100 Mbps (which requires a better signal level than minimum sensitivity) limits reliable performance to 8–12 km in typical terrain.
The Throughput-Distance Trade-off
As distance increases, free-space path loss increases logarithmically. To maintain link association, the radio steps down from higher-order modulation (1024-QAM, which requires strong signal) to lower-order modulation (BPSK or QPSK, which works at weak signal levels but carries far less data). A link delivering 500 Mbps at 2 km may deliver only 80 Mbps at 8 km on the same hardware.
When to Use a Relay Site
If the required path exceeds reliable range for the target throughput, consider a relay site — an intermediate location where two back-to-back P2P links are installed. Each link operates independently, and a switch at the relay site connects them. This introduces one additional hop of latency (typically 1–3 ms per hop) but allows multi-kilometer paths to be covered with standard unlicensed equipment. How these longer-distance deployments integrate with service delivery is covered in our guide to line of sight internet.
Frequently Asked Questions
What is the difference between a point to point wireless bridge and a Wi-Fi extender or repeater?
A Wi-Fi extender receives a wireless signal and retransmits it, creating a new network segment and cutting effective throughput roughly in half. A wireless bridge creates a transparent Layer 2 connection between two network segments. Devices on either side communicate as if connected by a cable — same subnet, same broadcast domain, no throughput penalty from retransmission.
Do I need a clear line of sight for a point to point wireless link?
True LOS with 60% Fresnel zone clearance is strongly recommended for reliable, high-throughput links. NLOS operation is possible using sub-GHz frequencies (900 MHz) or specialized NLOS-capable radios, but expect throughput reductions of 50–80% compared to a clear LOS link. For most enterprise and commercial applications, taller mounting structures to achieve LOS deliver better long-term performance than relying on NLOS propagation.
How far can a point to point wireless bridge reach?
Range depends on frequency, antenna gain, transmit power, and required throughput. At 5 GHz with high-gain dish antennas, reliable links of 8–12 km are achievable at 100+ Mbps. At 60 GHz, practical range is under 1.5 km. Licensed microwave links can span 30–50 km. Range claims in datasheets reflect minimum modulation rates; always calculate the link budget at the throughput you actually need.
What frequency band should I use for my point to point wireless link?
Use the decision framework from the frequency band section: 60 GHz for gigabit throughput under 500 m; 5 GHz for general-purpose links from 500 m to 10 km; 6 GHz where AFC access is available and interference is a concern; licensed microwave for mission-critical long-range links. 2.4 GHz is generally a last resort due to severe interference in most environments.
How do I align antennas on a point to point wireless system?
Start with a visual rough aim using compass bearings. Power on both radios and use the web GUI’s live RSSI display or the radio’s audible alignment tone. Sweep azimuth slowly to find peak RSSI, lock it, then sweep elevation. Tighten hardware and verify RSSI holds within 1–2 dB of peak. Both ends must be independently aligned. Document final RSSI and SNR values for maintenance baseline records.
What is a link budget and why does fade margin matter?
A link budget accounts for transmit power, antenna gain, cable losses, free-space path loss, and receiver sensitivity to determine the received signal level. Fade margin is the difference between the received signal level and the receiver’s minimum sensitivity threshold. A minimum fade margin of 15–20 dB is recommended to absorb signal variations caused by rain, humidity, atmospheric ducting, and minor antenna movement. Links with less than 10 dB of fade margin will experience intermittent dropouts under normal weather conditions.
Can point to point wireless work through trees or buildings?
Trees cause significant signal attenuation — a single mature tree can introduce 10–30 dB of loss at 5 GHz, enough to degrade or break most links. Buildings cause even greater loss. While low-frequency bands (900 MHz) can partially penetrate foliage, available throughput is limited. The practical solution is to mount antennas high enough to clear obstructions and maintain Fresnel zone clearance.
How do I protect outdoor wireless equipment from weather and lightning?
Use self-amalgamating tape on all outdoor RF connectors, form drip loops in cables before building entry points, and use outdoor-rated shielded Ethernet cable. Install surge protection modules on the Ethernet cable at the building entry point and bond all mounting hardware to the building’s grounding electrode system. In lightning-prone regions, consider a dedicated lightning rod above the antenna mounting point. Inspect weatherproofing annually, as UV exposure degrades tape and sealants over time.
Conclusion
The decisions that determine whether a P2P deployment succeeds — frequency band, antenna height, link budget margin, and installation quality — all happen before the first radio is powered on.
Key takeaways: define your distance and throughput requirements first, then select a frequency band using the decision framework. Calculate a link budget at your target throughput rate, not the radio’s maximum sensitivity. Verify 60% Fresnel zone clearance through a desktop survey before committing to mounting heights. Follow the antenna alignment procedure systematically and document your baseline RSSI. Weatherproof every outdoor connector and ground every mounting structure.
Equipment that costs $800 and is installed correctly will outperform $3,000 equipment installed carelessly. The site survey and link budget work described in this guide takes two to four hours — time that pays back immediately in a link that runs at specification from day one.
Regulatory EIRP limits referenced in this article are based on FCC Part 15 rules for unlicensed operation in the United States. International deployments should consult applicable national spectrum authority regulations.