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At the Wireless ISP I work at, we use almost exclusively for client-side links, YDI Etherant IIs. They're great. The radio-card is integrated right into the antenna, which drastically increases Signal to Noise ratio. What most people forget is that the coaxial cable from their radiocard to their (c)antenna is a source of loss and interference. I highly recommend YDI because they take this into account.

What you're looking for would be this it's the same thing, but would provide the access point. One could probably do it, but I'd put my money on two (seeing as how we don't know how thick and large the building is). If you put one at the top of the building in a corner facing diagnonally down, and another facing the opposite way tilted up, this will be MORE than enough coverage. From here, you would just have to plug the CAT-5 coming out the back into DSL routers which would then plug into your DSL/cable connection, and you're good to go.

I did a 21.7 mile shot using Cisco Aironet BR342, Andrew 19dB solid dishes, and YDI
500 mw amps.

I'm a bit embarrased to admit using a wireless LAN product for backhaul work, but some morons overtightened
the patch cable on an Andrew P2F 5.2-5.8 GHz 2' dish hooked to a WiLan AWE-120 5.8 GHz radio and put their link out
of service.

Despite extensive tweaking the link never managed more than analog modem speeds. It helped in recomissioning the UNI band stuff, but was otherwise
useless for hauling traffic.

802.11[bag] is NOT an access product. Take a look at Alvarion's Breeze Access II, or better yet just wait for an
802.16 product meant to do access work.

802.11[bag] is NOT a mobile access product. That market belongs to licensed band products with ISDN like performance offered by cellular companies.
Anecdotal evidence of mobile access to one police department in a town of 12,000 does not equal proof of concept for operation in urban areas; its plain
dumb luck coupled with no competing ISM band ISP(yet).

802.11[bag] is NOT a backhaul product. Backhaul radios are made by WiLan, Redline, Aperto, Proxim, and others. The minimum cost is $2,500 an end just for
the radio, most of them are in the UNI band, the full duplex products are generally split band 5.2/5.7 GHz, and they provide typically eight to ten
mbits for entry level products, unlike 802.11b which NEVER, EVER gets 11 mbits in long shots, with 1 or 2 mbits being the typical rate.

802.11[bag] SHOULD NOT BE DEPLOYED BY MONKEYS. Are you a MoNkEy? If you haven't read Matthew S. Gast's 802.11 book published by OReilly and you
don't fully grok the implications of the shared MAC layer, you are just throwing nuts and filth from the treetops into the already busy ISM band.

Slashdot's coverage of other topics is relatively even. The coverage of radio is focused on 802.11[bag] and this is quite laughable most of the time
to those of us who have actually owned and operated a wireless ISP. Personally I think the editors ought to be giving us a whole lot more information
on ICOM's D-STAR, a 23cm (1.2 GHz) amateur band voice/data system.

I don't understand how this is news for a number of reasons:

1> The math behind antenna design theory leaves little room for innovation. Two things determine how far your single is going to go a)the output power and b) the efficiency of your antenna. I don't see where this antenna design is any more efficient than many that are already on the market.. which leads me to..

2> There are already products on the market that can push WiFi signals well over 4 miles. Check out Motorola Canopy for their solution (it's geared more towards commercial enterprises, but for $2500 for an AP and two subscriber units, you can start a long-range WISP on pocket-change). Then there's companies like YDI, Wireless Central, and Tranzeo Wireless all selling long-range 802.11 products for cheap.

They might as well be putting out a press release saying they've invented a circular device that they're calling a "wheel".

i don't know what the legal power limit is for the 2.4ghz public band...but as long as no one complains, chances are you will have no problems.

this place has everything and it's probably all legal

this place has lots of cloices for high-gain antennas and good prices

build your own bi-directional 2.4ghz amplifier!!

802.11b tips and tricks from o'reilly

http://www.ydi.com
http://www.netnimble.com/products/index.html
http://www.superpass.com/

HTH! :-)