AEBS drops connection on one computer but not other

I have no idea what is going on. I have read a few threads in the AEBSn forum about intermittent dropouts after a firmware update, but mine is an older AEBSb/g. The strange thing is that I have my iBook and my iMac side-by-side, and most of the time the iBook connects effortlessly to the Airport Network (and then the internet), while the iMac sits there scanning for a network and not discovering one. Sometimes I am able to connect to the network initially on the iMac, but then it suddenly drops to no bars of reception, and I can't get back online. Sometimes it will automatically join again, or sometimes not.
I have taken to having the iBook connected to the Airport, and then sharing its internet connection with the iMac through the ethernet so that I can get the iMac online. I needed to do this to use Software Update to see if there were some updates that might fix this problem, but to no avail.
Right now the iMac is online, with 2 bars in the airport, and the iBook is also connected with full strength. Sigh. I just don't understand. The iMac has been my main computer for many years, and has been connecting to the airport for the last couple of years without major incident.
I did use the iBook to configure the AEBS recently, as I needed to change the network from WPA2 to just plain WPA to allow the iBook to join the network. But I'm pretty sure that the intermittent connection on the iMac started before I did that. In fact, I think I used the iBook to configure the AEBS because I couldn't keep the iMac connected long enough to change anything.
This is the longest the iMac has been online in quite some time. I am also able to switch to an external disk and start up in OS X 10.3.9 on the iMac (I created this startup disk when I upgraded to 10.5). It seems to connect just fine to the network/internet. In fact, after I do that and switch back to 10.5, I seem to have more luck connecting again in 10.5. But still not full signal strength - it fluctuates between 2 and 4 bars.
Anyway, I thought I'd start a new thread on this because of my situation with the two computers. It seems to rule out interference, anyway.

I just want to clarify that when I say the iBook is connected to the Airport, I mean it has joined my network wirelessly.

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