As Dave Robbins pointed out, topo maps indicate altitude ASL.
So do aeronautical charts. It's easier to talk about the
printed numbers, than it is to calculate height above average
terrain...which almost certainly will vary, based on azimuth.
And then, there is the question...why 5,000 or 8,000 asl?
The answer is....there's RF up there than never gets down
to the flatlands! (or so the lore goes.) :)
N2EA
jimjarvis@ieee.org
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See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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