Airport signal goes from 4 bars to 2 - How to fix?

Hello,
I have a PowerBook G4 1.67, last revision before macbook pro. Why is it that I can get full 4 bars on my Powerbook G4 Pismo and on my Mac Pro, but on my PowerBook G4 it fluctuates between 4 bars and 3 bars and then 2 bars??? I took my PB to the Apple store yesterday and the genius told me that my connection is fine and no problems.. for 20 minutes, the bars showed 4 while in the Apple store. I am not sure why my PB loses signal or gets weaker when I am in my room.. Can someone shed some light as to why my Pismo has full bars, my mac pro also.. but yet my PB G4 doesn't after say 10 minutes?

It's possible that there is some source of interference in your room (but not in the store) to which your Powerbook is more susceptible than your other computers.

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