Look for the one SSID that is unaffected and I'd bet you'd find the culprit. It's possible that someone set it up solely to screw up WiFi for everyone else but

Look for the one SSID that is unaffected and I'd bet you'd find the culprit. It's possible that someone set it up solely to screw up WiFi for everyone else but I'd bet money that the reason why they did that is specifically so that the spectrum is left wide open for themselves. WiFi in an apartment right next to a bunch of businesses generally sucks because of the density, it's probably just some selfish script kiddy thinking they're some uber l33t hacker and thinking they can't be caught screwing over their neighbor's WiFi.