My 2.4 GHz channel frequently toggles between "severe" and "normal" when I log in and watch my router (it's still usable usually unless I power up my Microwave). My 5 GHz channel stays "normal", but the speed drops off unless I'm fairly close to the router. There are literally dozens of APs listed when I do a scan and no free channels, which is boggling considering there is open space behind my house and my two immediate neighbors don't have WiFi (or didn't originally). So I'm picking up dozens of WiFi signals (a number of them quite strong) from across the street and down the block. So I agree that WiFi signals go a "long, long way".