The gear being used is made by Tranzeo: http://www.tranzeo.com/

Another vendor we were looking at was Trango: http://www.trangobroadband.com/

How difficult it is? Not hard at all. If you already have towers or structures on which to mount the gear, you're more than halfway there. The best thing to use for these point:multi-point installations, IMO, is 5.8GHz gear, simply because you get higher gain in the same sized panel.

The CPE units being used here are now:

http://tranzeo.com/products/radios/TR-SL5-Series

In the Trango gear, we were looking at this CPE:

http://www.trangobroadband.com/products/access5830_ap.shtml

I should make it clear that after all the work and planning we did at the county level, we had a WISP company from elsewhere here in rural Nevada (from Winnemucca) literally just "walk in" to our county officer who was the contact point and say "Hey, we've built a bunch of these wireless networks elsewhere in rural Nevada... any interest around here?"

Talk about serendipity. We just told them of all our design work, where we had planned on placing towers to mount the units, etc, etc and they dovetailed right into what we had already done. Now the county doesn't need to run all the billing, CPE installation, etc.

In general, here's what we figured out:

1. Don't use 802.11b/g/a/whatever gear for running a WISP. From everything we've found, the 2.4GHz gear just isn't up to the job for running a WISP. For example, the Trango gear has provisions for "committed information rates" and the Tranzeo has a "bandwidth shaping" unit that you could install at the point where the WISP ships the traffic down your terrestrial link.

2. The 5.8GHz backhaul units are very much better than trying to do  a long-distance backhaul with 2.4GHz gear, again, because the antennas give you higher gain for the same size dish/panel/etc.

If you've got more questions, just ask. This 5.8GHz stuff works well, it installs like a dose of sugar. Just mount a pole on the side of the house, make sure you're using the same antenna polarization as the access point, then wiggle the panel back and forth to get the max # of LED's on the back of the panel to light up and voila! Done.