If you can make a point to point bridge run close to error free while maintaining at least 20 Mb/s throughput, you'll have this nailed...
Here's a bridge kit that looks like it's worth investigating further,
http://www.radiolabs.com/products/wi...bridge-kit.php
My experience has been that the 2.4 GHz band WiFi band is plagued by interference from leaky microwave ovens, cordless phones, co-channel WiFi networks, etc. Still, if you use the right WiFi antennas at each end of the link, you have a better than average chance in a rural or suburban environment.
I'd love to hear how this progresses...