Setting up a wireless communication channel between two remote objects is a task that requires precision and an understanding of the principles of radio transmission. WiFi bridge Ubiquiti is one of the most popular solutions on the market due to its reliability and affordability. Unlike traditional routers, it utilizes directional signal transmission, requiring line-of-sight and proper antenna polarization.
In this article, we'll walk you through the process of setting up airMAX series equipment, which allows you to create stable communication channels over distances of up to several dozen kilometers. You don't need to be a communications engineer to assemble a working setup, but a basic understanding of IP addressing and wireless networking is required. We'll walk you through the process, from unpacking the devices to the final speed test.
It's worth noting that the airOS firmware interface may change depending on the version, but the operating logic remains the same. Ubiquiti is constantly improving its algorithms, adding new noise reduction and traffic optimization features. So even if the menu looks different, the principles described below will remain relevant.
Equipment selection and route planning
The first step is to select the appropriate devices. To set up a bridge (Point-to-Point mode), you will need two identical or compatible antennas. The most commonly used models are the NanoStation or LiteBeamIt's important to understand that reliable operation over long distances requires a clear line of sight. Any obstacles, such as trees or buildings, will absorb the signal.
When planning, consider the Fresnel zone—an ellipsoid of space around the direct line of sight that must be clear of obstacles. If the Fresnel zone is blocked, connection speed will drop and ping will increase. The 5 GHz frequency band has higher clearing requirements than the 2.4 GHz band, but there's significantly less interference in this range.
⚠️ Attention: Avoid installing antennas too close to metal surfaces or roof parapets. Metal creates signal reflections that can interfere with the main beam, causing a drop in speed (the multipath effect).
Determine the distances and select models accordingly. Below is a table of approximate distances for various models when used in bridge mode:
| Device model | Frequency range | Recommended distance | Speed (real) |
|---|---|---|---|
| NanoStation 5AC | 5 GHz | up to 5 km | up to 400 Mbit/s |
| LiteBeam 5AC Gen2 | 5 GHz | up to 15 km | up to 600 Mbps |
| PowerBeam 5AC ISO | 5 GHz | up to 20+ km | up to 800 Mbps |
| Nanobeam 5AC | 5 GHz | up to 10 km | up to 300 Mbit/s |
Connection and initial IP setup
After installing the antennas, you need to connect them to the computer for configuration. Each antenna Ubiquiti has a static IP address by default 192.168.1.20You need to configure your laptop's network card to the same subnet, for example, assign it an address 192.168.1.25 with a mask 255.255.255.0.
Connect the Ethernet cable from the antenna to the computer's LAN port. If you are using a PoE injector, make sure the power supply is plugged in and the injector's indicators are lit. Open your browser and enter [website name] in the address bar. https://192.168.1.20Your browser may warn you about an insecure connection. This is normal, as it uses a self-signed SSL certificate. Accept the risk and proceed to the site.
When you first log in, the system will prompt you to change the default password (login and password are usually ubnt). Necessarily Change it to a complex password to prevent unauthorized access to your device. After changing the password, the device may reboot.
Setting up a Master Point (Access Point)
Now let's move on to configuring the first antenna, which will operate in access point mode (Master/AP). In the airOS interface, go to the section WirelessIn the field Wireless Mode select Access PointThis is the key point: one side must always be the Master and the other the Station.
Enter a network name (SSID). This name will be seen by the second antenna when scanning the air. For security, it's best to use a unique name that doesn't contain personal information. In the field Channel Width Select the channel width. For maximum speed and stability in the 5 GHz band, it is recommended to use 40 MHz or 80 MHz, if the airwaves are not overloaded.
- 📡 Frequency: Select a clear frequency. Use the built-in spectrum scanner (AirView) to find a clear channel without adjacent signals.
- 🔒 Security: Be sure to enable WPA2-AES encryption. The password should be complex, as the radio channel can be easily eavesdropped on.
- 📶 Output Power: Set the transmit power. Don't set it to 100% right away; start with 50-70% and increase it only if the signal is weak.
After making changes, click the button Change, and then Set (or Save) to apply the settings. The device will overwrite the configuration and may reboot. Make sure you are connected to the correct network if you changed the IP address.
☑️ Setting up a Master Point
Setting up a Slave Point (Station)
The second antenna is configured in a similar manner, but with important differences. Connect to it (after changing the IP address on your computer if the devices have the same addresses, or by connecting them one by one). In mode Wireless Mode select Station.
Click the button Select next to the SSID field. The device will begin scanning the air. You should see the network name (SSID) you set on the Master Access Point in the list. Select it. If the network is hidden, enter the name manually. Once selected, click Lock to AP (Lock on AP) to prevent the antenna from switching to other signals with the same name.
⚠️ Attention: In Station mode, you cannot use NAT or a DHCP server unless you plan to create a separate subnet behind this antenna. For transparent bridging (Layer 2), all IP settings must match those of the main network.
Check the signal level (Signal) and quality (CCQ). A signal better than -60 dBm and quality above 90% are considered good. If the results are lower, more precise alignment (pointing) of the rooftop antennas may be required.
What to do if the antennas cannot see each other?
Make sure the frequencies match. Check the polarization (vertical or horizontal)—it should be the same on both antennas. Make sure there are no obstructions between the antennas.
Fine-tuning and link optimization
Once the link is established (status Connected), optimization is required. Go to the section Advanced or ServicesHere you can disable unnecessary services, such as Ping Watchdog, if you don't use it to automatically reboot when the connection is lost, which will save CPU resources.
An important parameter is AirMAX QualityThis TDMA technology avoids collisions in a wireless environment. Make sure it's enabled (AirMAX Enabled: Yes). Also, pay attention to the Jumbo Frames setting. If your network equipment supports MTU 9000, enabling Jumbo Frames may slightly improve the efficiency of transferring large files.
For video surveillance or VoIP telephony, low ping is critical. In this case, you can try reducing the channel width to 20 MHz. This will reduce the maximum throughput, but will improve stability and range, and reduce the impact of noise.
Antenna alignment and final tests
Physically adjusting the antenna's direction is the final and most important step. This requires two people or the use of radios or telephone communication. One person monitors the Signal and CCQ indicators in the interface, while the other slowly rotates the antenna.
Move the antenna very smoothly, pausing for 2-3 seconds after each movement, as the interface data does not update instantly. Find the position where the signal strength is at its maximum, and then tighten the mounting bolts. Do not overtighten the bolts to avoid damaging the plastic housing.
- 🔍 Azimuth: Horizontal direction. Corrected first.
- 📐 Tilt: Vertical angle. Important if the antennas are at different heights.
- 🔄 Polarization: Rotation around its axis. Must strictly coincide (vertically or horizontally).
After fixing the problem, run a speedtest through the created bridge. Compare the results with a direct connection to the ISP. Speed losses shouldn't exceed 10-15% of the theoretical maximum. If losses are significant, check the cables and connectors for corrosion or poor connections.
Why is my Ubiquiti WiFi bridge speed dropping?
Speed may drop due to interference with neighboring networks, the appearance of obstacles (trees, buildings), bad weather (rain significantly absorbs the 5 GHz signal), or equipment overheating. Using low-quality cables (not Cat5e/Cat6) longer than 80 meters may also cause this.
Is it possible to connect three buildings into a ring?
Ubiquiti airMAX equipment supports a Point-to-Multipoint topology (one base station and multiple clients), but a ring topology requires more complex configuration (WDS or OSPF) and is generally not recommended for beginners due to the risk of switching loops. A simpler approach is to use a star topology: one powerful antenna in the center and two antennas directed toward it.
What kind of weather can the bridge withstand?
The NanoStation and LiteBeam series devices are IP67 rated, meaning they are completely dust- and water-resistant. They operate normally in temperatures ranging from -40 to +70 degrees Celsius. However, heavy rain or snowfall may temporarily reduce channel throughput.