There's an interesting article at:
http://www.gordon.army.mil/AC/Fall02/BCTSOP2.htm
which discusses various HF comm modes, with a fair amount of detail on
NVIS. In particular, go about 2/3 of the way down to where they start
talking about horizontal dipole antennas. There's a chart showing
performance (straight up) for halfwave dipoles over "average" and "perfect"
ground at various heights and frequencies (all the way down to 0.1 ft). and
a discussion of preferred heights (30 ft is recommended)
http://www.gordon.army.mil/AC/Fall02/dffig15.jpg
_______________________________________________
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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