Original Airport Card: Intermittent connection to internet

I have a wireless (netgear router) home network that has been running fine for over a year. Two dell laptops and Two iMac computers connect wirelessly w/o problems. Last week the iMac (original G4 FlatPanel) with airport card located in the basement start dropping the network (no network detected). All other machines still work fine. The laptop taken into the basement work fine.
The original iMac shows the airport power "on" but no network to connect to? Laptop show network and good signal strength. Next time I check the iMac, its connected with excellent signal. Next time....gone! This has been ongoing on for over a week now. As of late it's see no networks (there's 3 in my neighborhoos - mine and 2 others)
Is it interference? Faulty Airport card? Gremlins?
Any suggestions? Thanks!

If you move the G4, having the problem, to another location nearer your router does it still exhibit these problems? You mentioned that if you tried with one of your Dell laptops, at the same location as the G4, it's working fine...correct?
I'm leaning toward your AirPort card in the G4 is failing vs. interference as the cause of your intermittent connections.

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