On 8/26/2020 4:20 PM, Nate Bargmann wrote:
A low horizontal antenna has its place, for local work especially out to
a few hundred miles reliably. Horses for courses and all that.
That's an urban myth. A low horizontal antenna is very lossy, and has
much weaker radiation at ALL angles, including high ones. The origin of
the myth is that ARRL Antenna plots set the peak radiation to 0dB. But
when plot the vertical field strength for all heights on the same scale,
you get the family of curves beginning with slide 13.
Study http://k9yc.com/VertOrHorizontal-Slides.pdf
There is an optimum range of heights for high angle radiation, and it
isn't low. Slide 19 shows that the optimum height is about 55 ft on 80M,
and high angle drop by only 2 dB at 90 ft. Divide those heights by 2 for
40M.
73, Jim K9YC
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