I don't understand the signal that a wireless base station sends, so I don't understand how the extending capabilities of an Airport Express function. When I sit at my desk upstairs, I get one to two bars from the Airport Extreme base station downstairs. It seems to me that if I plug my new Airport Express base station in up here, it'll only be picking up one or two bars and it is only extending a degraded network. I'm sure I'm not understanding this correctly, because that seems nearly useless. Can someone explain this too me in laymen terms what's going on?