On Sat, 22 Dec 2007 23:03:11 +0000, Larry wrote:

Wifi will NOT go reliably over 500 yards because of the very intense
data storm which cannot tolerate the multipath reflections, which are
awful on 2.45 Ghz. The speed wifi runs is its worst enemy in range.

That is totally incorrect. I have two external WiFi antennas on my
boat and routinely connect to access points that are over a mile away,
sometimes 2 or 3 miles.

One antenna has a 30 ft downfeed of LMR-400 low loss coax connected to
a high power USB adapter (Senao EUB-362 EXT), the second antenna is
connected to an adapter with power over ethernet capability
(ENGENIUS/SENAO EOC/NOC-3220). Both antennas are vertical high gain
omni-directionals.

I get most of my WiFi equipment from he

http://www.wlanparts.com/

and have been very satisfied with their prices and service.