Hi, I've got a Powerbook G4 12" with an Airport Extreme Card in it. i recently bought a Belkin wireless router (it was cheap) but i found that the signal was very poor. there wasn't a signal upstairs in my house. just wanted to know what the signal is like for an Airport Base Station. does the signal go thorugh walls? the room which has the broadband connection in is downstairs so the airport will have to go there...will it stretch to my bedroom which is upstairs, through a door and about 20metres away? please get back to me, purchase of one is imminent.