RF Scan for Optimizing UniFi Networks

When it comes to getting the best performance from your UniFi network, you can’t skip RF scanning. This often-overlooked tool helps you dodge interference, avoid crowded channels, and boost overall network performance. Whether you're dealing with a home setup or a large office network, RF scanning is a game-changer.

Let's dive in!

What is RF scanning?
How RF scanning works
How to run an RF scan on UniFi
Interpreting RF scan results
How to change the channel on UniFi APs
Pro tips for UniFi network optimization
Common RF scan issues and solutions
Why RF scanning is essential
Final Thoughts

What is RF scanning?

RF scanning is like Wi-Fi detective work. It scans the airwaves to see what channels nearby devices are using. The goal is to figure out where the "noise" is so your UniFi access points (APs) can avoid it.

Wi-Fi runs on the 2.4 GHz and 5 GHz frequency bands. Both are shared with tons of devices — from your neighbor's Wi-Fi to your smart fridge. When too many devices use the same channel, it’s like too many people talking at once. RF scanning identifies which channels are packed so you can switch to a quieter one.

Key benefits of RF scanning:

Less interference: Skip crowded channels and avoid "Wi-Fi fights."
Better speeds: Unclogging the channels leads to faster connections.
Stronger signal: You’ll experience fewer drops and lag-free browsing.

How RF scanning works

When you launch an RF scan, your UniFi access point temporarily stops broadcasting Wi-Fi. Instead, it "listens" to the airwaves, collecting info on which channels are being used and how much traffic is on each. Once it’s done, it gives you a report on the best channels to use.

Here’s what an RF scan typically shows:

Noise level: Measures interference from non-Wi-Fi sources like microwaves and Bluetooth.
Channel usage: Shows how many networks are on each channel.
Signal strength: Indicates how strong other Wi-Fi signals are on those channels.

These insights let you choose better channels and avoid the ones that look like rush-hour traffic.

How to run an RF scan on UniFi

Running an RF scan is super simple. Here’s the step-by-step process:

Step 1: Log in to UniFi Controller

Open the UniFi Network Controller via your web browser or mobile app.
Use your login credentials to sign in. If you’re using UniHosted, you can log in remotely without needing local network access.

Step 2: Navigate to RF Scan

In the controller dashboard, go to Devices.
Select the UniFi Access Point (AP) you want to scan.
Scroll down and look for the Tools section.
Click on RF Scan.

Step 3: Start the RF scan

Hit the Start Scan button.
The access point will temporarily pause Wi-Fi services while it listens to the airwaves.
Once it finishes, you’ll get a detailed report.

Interpreting RF scan results

Here’s a quick guide on how to read and use the scan results.

1. Noise Level

What it is: Measures background interference from non-Wi-Fi sources (like microwaves or Bluetooth).
What to do: Lower numbers are better. If a channel has high noise, avoid it.

2. Channel Utilization

What it is: Measures how crowded each Wi-Fi channel is.
What to do: Switch to a channel with lower usage. Channels 1, 6, and 11 are often your best bets for 2.4 GHz.

3. Best Channel

What it is: The system suggests the best channel to use.
What to do: Follow this suggestion unless you have other network devices that require a specific channel.

How to change the channel on UniFi APs

Once you know which channel is best, it’s time to switch.

Go to the Devices tab.
Click on the AP you want to adjust.
Go to Configuration > Radio.
Change the Channel setting for 2.4 GHz and 5 GHz bands.
Click Apply Changes.

Done! Your Wi-Fi will now use the optimized channel for better performance.

Pro tips for UniFi network optimization

Here are some extra tips to get even more out of RF scanning and your UniFi network.

1. Schedule RF scans regularly

Do this every month or if you add new smart devices.
Interference changes, so keep an eye on it.

2. Use automatic channel selection

Let the UniFi system choose the best channels automatically.
This way, you’re always on the quietest channels.

3. Avoid DFS channels (when possible)

DFS channels can be interrupted by radar signals.
If you’re not near an airport or weather radar, you might be able to use them, but be cautious.

4. Use UniFi's Wi-Fi AI

If you’re feeling lazy, enable Wi-Fi AI.
It automatically scans and updates channels during off-peak hours.

Common RF scan issues and solutions

Problem 1: The RF scan won't start

Fix: Restart the access point. It might be stuck in an update.

Problem 2: The scan takes too long

Fix: Make sure no one is using the network since the scan pauses Wi-Fi. Run it at night or during off-hours.

Problem 3: You’re still experiencing Wi-Fi drops

Fix: It might be time to re-scan and double-check for interference from non-Wi-Fi sources (like microwaves or Bluetooth).

Why RF scanning is essential

Why should you bother? Because skipping it means you’re flying blind. RF scanning helps your UniFi APs "see" their surroundings, so they can avoid interference and deliver peak performance. It's like knowing which highway lanes are packed before your road trip.

If you’re managing a business or office network, it’s even more important. Nobody likes buffering during a Zoom call, and RF scanning is one of the easiest ways to avoid it.

Final Thoughts

RF scanning might sound techy, but it's one of the easiest ways to supercharge your UniFi Wi-Fi network. It helps you dodge crowded channels, reduce interference, and keep your speeds fast.

If you’re managing multiple locations or looking for a hassle-free controller experience, consider UniHosted. We make it easy to manage your UniFi Controller with automated updates, backups, and 24/7 monitoring. If you would like me to personally walk you through UniHosted, you can schedule a call with me here.