Signal hasn't worked properly since logic board replaced

My logic board went out a 6 weeks ago, and I had it and the topcase replaced. Since getting those two components replaced, I no longer can pick up wireless signals in public places. I say "public" because at home, I can pick up the signal, but that's because my desk sits atop the base unit. So it's only when I'm out do I notice the problem.
I thought maybe it might be the logic board again, or the airport card, so I had the technician replace it again. So I have had the logic board replaced TWICE and had a new airport card installed. Same deal. It's software related from what I can tell.
Here's one symptom that is strange. As time progresses, it gets worse. So I started at 3 bars this morning, and finally the signal disappeared. I rebooted, and it came back, but at 3 bars. What is causing this? Do I need to wipe clean the HD and just reinstall OSX? I backed up everything last night preparing to do that, but wanted some info. I also have applecare, but right now, work's so chaotic I can't afford to be away from the computer.
PLEASE HELP!

You wrote:
"I doubt that reinstalling OS X would help here. From the following reference you can see that the iBook G4 uses an AirPort Extreme card. (ref: http://docs.info.apple.com/article.html?artnum=26277) Most likely this card was removed in order for the technician to replace the logic board. The card also has an antenna cable attachment.
I suspect that this cable is not fully attached, and may be worth having a look at to verify. (ref: http://docs.info.apple.com/article.html?artnum=108039) "
You may be right, but this is hard to believe in some respects. When I took it in the first time, the Airport Extreme card was not changed out, and the problem immediately materialized after teh logic board was replaced. I took it back a second time, and the logic board was re-replaced. I also requested a new Airport extreme card. That too was replaced. The antenna was also checked. None of this appears to have made a difference.

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Signal hasn't worked properly since logic board replaced

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