Dropping signal strength

hello,
recently I have changed from an AirPort basestation to an Airport Extreme basesation.
There are two iBooks (G3 and G4) and a PowerBook G4 using the wireless LAN.
Having now installed the latest (driver) software from Apple my iBook G4 (running on Panther) has four bars signal strength when booting or waking up. But within 20 to 30 seconds the signal strength drops to only two bars in the menu list.
This is strange to me because the PowerBook G4 (running on Tiger) has always four bars even if they are on the same table about 4 meters from the AirPort basestation away. Usually the PowerBook is further away and still has its four bars.
With my old AirPort both computers had always four bars.
Where shall I start searching to solve this?
If the signal drops even to one bar then sometimes the connection to the Internet is very poor (eg I had to click a hyperlink twice to get the page or I will run into a network timeout).
thanks for your help
ueli
iBook G4   Mac OS X (10.3.9)  

the problem is solved, it had nothing to do with the change of the AirPort base stations. The iBook G4 had a broken antenna cable.

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