I bought an airport express with the hope of extending my wireless network to accommodate an internet tv box in the living room. it didn't work in a variety of different ways. The main way was that there wasn't enough bandwidth to being supplied to the tv box to display the tv properly. A secondary problem was that when I tried to do that, I would pretty much lose my wireless connection. I would still be connected, just my internet speed dropped to pretty much zero. 5 hours later, I've found that even if I connect a LAN cable from the tv box to the TC, I'll lose my internet speed. I have a special ISP provided router that I need to use to access the internet. The TC is plugged into that and is set to bridge mode. It's broadcasting a b/g/n network. If I wire the tv box directly into the ISP supplied router, my wireless internet speeds are barely affected. Something in the Apple machines are screwing things up. What could it be?