I got an Airport Express, and my Powermac and Powerbook are loaded with Airport Extreme cards. My house is now "wireless" I have "Comcast" cable as my IP. My signal is constantly and daily dropping to 48 Mps and down to 1 Mps, internet becomes as slow as Dial-Up. I live in an apartment, and I have moves the airport in 2 different locations in my living room. What could be wrong? Please advice me on how to troubleshoot... Thank you!