I have an AirPort Extreme Base Station located in one end of my house. In order to get a somewhat usable wireless internet connection in my bedroom located at the other end of the house, I need to extend the network (using an AirPort Express) at the 25 - 30 feet mark. My house is 'L' shaped, so there's probably only 2, maybe 3 walls for the WiFi signal to go through to get to my room in a straight line. Yet, it doesn't give a nice, healthy signal. Is something wrong with my setup, or is it just bad luck?