15" Powerbook - Wireless is weak to ABS.

Hi Guys,
Got a 15" PB, and have setup an older version Extreme base station for wireless access around the house - trouble is, that after working well for many years in another home, I'm struggling to get any kind of connectivity to it at all!
At times I can't see the ABS in the Airport Admin Utility at all, then other times it appears? General signal strength is weak, and to make matters worse, another guy in the house has a Windoze laptop, and seems to be connecting OK! So what's with the Powerbook?
Is there any way of checking that the Airport Card is still up to scratch?
Cheers
SG

Some models have easy access to the Airport card through the battery compartment; others are not accessible without taking the whole top off.
I don't know of other general test procedures, sorry. Perhaps the Apple Hardware test on your OSX DVD, but since it seems to work, though poorly, I think those tests will just show it to be OK. I would suspect the antenna first (loose connector, perhaps broken wiring through the hinge), then certainly try changing the wifi channel in the base station.

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