I just had some major problems involving my Airport card and the DSL Wireless Hub/modem.
A couple of weeks ago a at&t contractor was checking cable pairs to make sure that they match the records; we all know that there are a lot of errors; anyway he moved me over to the cable pair that his records showed, the problem was the cable he moved me to had a dead short; i.e. no phone or DSL for 4 days, they got that fixed but my speed was down really bad. They found 2 bridge taps on my cable; I guess DSL does not like those, they removed them and my speed came back up a great deal, but not what is was supposed to be. The strange thing is my ethernet connected computer is working fine. I made no changes on either setup and both were working fines before the repair from hell started. I do know that there is a little loss on wireless connections, but not 1.3 on a 6 meg link. I asked on the Mac groups, but no answers. I'm sure it has something to do with my AirPort card and the Router, but as I said no changes were made and all the setting are the same.
There are other problems, like on 26 ga led cable, that AT&T plans to replace some time next year when they plan on finally offering U-Verse on my block, we are only block not to have it since our cable is over 30 years old.