Cant connect to home WiFi AP (in repeater mode), although strong signal

thanks for your support! I put in a very inexpensive router from Airlink 101, AR-430W, and after boosting the signal with a parabolic antennae, it is far exceeding my expectations and I have been able to receive a good strong signal at 250 ft. plus. I'm in a small rural community setting and it is necessary to expand the range, so an AP/repeater was obtained and activated, also an Airlink 101 product, 'AP-431W', and only Windows based computers can access the signal(now). As a matter of fact, the signal is now stronger and steadier, apparently, on my Mac, but I am just unable to access anything on the internet as long as I am in range of the AP/repeater. If I return near the primary router I can again access the signal from there. But now my magnificent range is completely compromised by the incompatibility of the new equipment, and Internet access is limited to close range.
I talked to Airlink support about it and they said to make sure I have the latest drivers for my wireless card, but all my software is up to date. Working with routers and access points is something of a new adventure for me, so I am still learning. It appears that I have just about reached a dead end with this particular AP/repeater configuration, but there may be something I haven't tried yet.
If I am out of options relative to this equipment, then I will have to find a better repeater/AP that is compatible with Mac. Linux OS was also unable to connect from the AP. Is there a better inexpensive Wireless repeater available for those of us on a low budget?
How about the Belkin F5D7132 Wireless-G Universal Range Extender? I read some good reviews about it on Amazon.com, and it is compatible with Macintosh.