Rick wrote:
I haven't scientifically tested that but it does seem to me that since
most NVIS radiation goes approximately straight up (definition of NVIS),
it really shouldn't matter much how the antenna is oriented.

Have you all found that to be true, or false?

With a 130 ft dipole at 30 feet, the azimuthal radiation
pattern at 60 degrees is 3 dB down off the ends of the
dipole. I have never seen the minimum NVIS angle
defined anywhere.
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73, Cecil http://www.w5dxp.com