My house is wired for ethernet, and I have several airport products. I had it running pretty decently until I added a new (or refurb) Airport Extreme. I made that my main router, and relegated my 1st gen Time Capsule to act as an added base station. I continue to have two airport express, one of the older plug-in types and the other the mini-TC like one. I have them distributed around my house in different corners and floors. The problem I'm having seems to be interference - in some places I can't connect to the wifi network. It will either say unavailable or will ask for the network password, which it rejects. If I move to the other side of the room, or to a different room, it will connect. I haven't played too much, but it seems like the problem arises if I'm roughly the same distance from two of the access points. Any tips on reducing/eliminating this problem?