The image below shows the spectrums used by each router channel, with ANT+ labeled in blue. If your router uses 2.4Ghz (which most do) and chooses any channel from 9-12 it could very well cause interference with ANT+. Most people set up their wifi routers with default settings, which means the router chooses which channel to use when it boots up. Here is one which comes highly recommended on Amazon. If you need a cable more than about 3 meters in length you should purchase an active USB extension cable to ensure a strong signal.

Now you can place the dongle wherever you’d like. Fortunately, this, is easy to fix! Simply buy a USB extension cable ( here is one we recommend from Amazon) then install it with one end plugged into your computer and one end into the ANT+ dongle. If your ANT+ dongle is more than a few feet away from your bottom bracket, it’s possible the signal from your sensor(s) is not reaching the dongle. Fortunately, if your problem is weak signal or interference it is usually fixed quite easily. This is by far the most common reason for ANT+ drops, and it’s due to the inherent weaknesses of ANT+ as a wireless protocol. What causes dropouts, and how can you avoid them? Usually this works wonderfully well, but occasionally Zwifters encounter the dreaded ANT+ dropout: that frustrating event when Zwift stops receiving data from your sensors. Zwift connects to your sensors (smart trainer, power meter, heart rate monitor, cadence, speed) wirelessly using Bluetooth or ANT+.

How to find wifi interference