Airport card can not see network.

I have recently moved. I had no issues with the my network on my G5. We moved, I bought an Airport Extreme and set it up through Qwest DSL. My G4 laptop, my iphone, my roommates G4 laptop and his dell laptop all successfully see and login into our network just fine. However my G5 doesn't see any network available. Like I said, in our old spot, everything was fine. Any Suggestions? Thanks in advance.
Wireless Card Type: AirPort Extreme
Wireless Card Locale: USA
Wireless Card Firmware Version: 405.1 (3.90.34.0.p18)
Current Wireless Network: wireless network not available

I've been experiencing similar difficulties with connecting to my wireless router and dropping signal connections.
It almost seems to be in the same vein as SCSI voodoo. One day it works and another it doesn't.
One thing that seems to reduce the problems is to use only WEP protocol. I have rarely been able to connect using any of the stronger schemes, although my wife and daughter using pro laptops have few problems with connections.
My G5 does not have an external antenna, which I suspect is part of the problem.
Mike

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