I have an existing wireless network with a Netgear 108mps wireless router. I tried adding a Airport base station. My Pc's detected the base station but my G4 did not. The G4 is in another room using an Airport card. I am not getting any signal strength on the G4. I thought that maybe the 2 routers may be interfering with each other so I tried only connecting the Airport base station to my cable modem. My Pc's picked it up but I was not able to get on the web. Can these 2 devices work together in the same area? Does my Mac need an external antennae?