On Wed, Apr 15, 2009 at 09:11:44PM -0400, Skip Gundlach wrote:
> By popular request, here's the transcript:

[snip]

Thank you very much, Skip - great run-down, and much appreciated!

Just FYI, though: if the furthest WiFi connection you've ever made is 7
miles (which is a heck of a distance, given the average!), then you
don't need all that much height. Assuming a 7-mile maximum distance,
here's a chart of required line-of-sight heights for a range of assumed
access point heights:

AP height               Required receiver height
0'                              38'
1'                              27'
2'                              23'
3'                              20'
4'                              17'
5'                              15'
10'                              9'

For the rest of it, you can (of course) reverse the two columns; in
other words, if the AP antenna is 38' high, you can have yours at the
surface of the water, and you'd still see them at 7 miles. :) Given that
the average ISP/AP owner is *trying* to get the service to you, they'll
usually have a fairly tall antenna.


-- 
* Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *
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