I'm no wireless expert, but doesn't WiFi have more error managing protocols along with a difference in the frequency it runs at?

In an RF hotspot, I don't think there is much you can do other than experiment with the equipment with different antenna in different places, possibly even farther away with cat5, and having the entire unit even farther away and longer cables.

It can be a real beggar, but I've seen some pretty interesting stuff done to alleviate horrible RF interference with the same equipment moved into different places with different configurations, wiring, etc.