I'm sure that my question was covered before, but after reading numerous posts and articles elsewhere, I still don't find an exact answer to my problem. I have a cable internet connection. My modem is in our garage on the ground floor (and cannot be moved). I have been using an Airport extreme installed at my office on the first floor (needed it there to connect a printer and a hard disk to share across the network). The Airport Extreme was connected to the modem via a CPL unit. Last month, my internet connection was upgraded to 30MB. When testing the actual connection on my computers I got a slower connection. I isolated the problem to the CPL unit. When connecting my base station directly to the modem, i enjoyed the full speed on the wireless connection. To remove the CPL, I bought yesterday an Airport Express. I set it up as an extension to my Extreme's wireless network (the Extreme now moved downstairs to the garage), and connected it in my office to the printer. Upstairs with my iMac the result is perfect and I still have my full connection. Downstairs with my macbook however the connection is now much than it was before. Is it possible that the Express is actually slowing down the wireless connection in certain parts of my house. What would be the optimal setup between the units in my case? Thanks for any advice!