Boosting wireless reception on iMac G5?

The rural community I live in has recently set up a satellite-based WiFi network for the locals to use. The main signal is brought in, then repeated out to several remote access points within the community. One of these points is directly opposite my house, about 300 yards away. This access point is an Airport Extreme base station, set to repeat out the signal.
I can "see" the nearby access point with both our iMac G5s and also with our iBook. The iBook gets usable signal strength (3 bars), but neither of the G5s get enough signal to be useful (0-2 bars). Both iMacs have Airport Extreme cards. The iBook has a plain Airport card.
I have reseated Airport cards and antennas, and checked for a fully-seated antenna connection. I'm confident this is not the problem. Plastic tab on the antenna lead is removed. I have changed channels several times.
Is there any way to boost the reception of these iMac G5s? Any way to set up an external antenna to improve reception? Any way to setup our network to make this work?
In an ideal world, I'd hope for some solution that all our computers could use, even the iBook. We do have a Windows machine we could use as a network hub, but I'd prefer to keep it in the closet where it belongs.
Resources:
2x iMac G5 (Airport Extreme card)
G3 iBook (Airport card)
15" gooseneck iMac G4 (no wireless card)
S6010v Compaq Presario (NIC card yes, wireless card no)
D-Link DI-524 Wireless router

I've read over and over that reseating the antenna and trying different channels is the way to solve the problem. Apparently, you have to reseat the antenna cable with much more force than you'll probably think is appropriate (check the archives for confirmation of this).
However, I have a question - for those of us with Rev. B iMac G5s, how do we do this? Apple provides instructions for the Rev. A models, but I don't have an Airport card where they show it. Does anyone know, and has anyone successfully reseated it on a Rev. B machine?

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Thanks
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I work on behalf of HP
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Boosting wireless reception on iMac G5?

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