Some times you have a poor WiFi signal and you just do know why. That's where WiFi Analyzer comes in. It will help you determine signal strength, what other wifi access points around as well as what channel they are broadcasting on. There are plenty of other things that WiFi Analyzer can do, but to find out you will have to watch.
This video was taken using a Vixia HF R400 with these settings;
Auto .mp4 @ 35mps
Wireless mic; Audio Technica ATR288W VHF