I think our main disagreement comes over the the maximum
angle that is supported on 10M. I believe that to be around
20 degrees (at very high MUF's).
Some time ago, someone plotted his 10M SS contacts on
a map. The vast majority were at skip distances of 900 miles
or more, which corresponds to a 20 degree takeoff angle.
At 18 ft, a 3L 10M Yagi places the majority of it's radiation between
20 and 30 degrees. 3 dB points are 15 and 40 degrees. Over
80% of the energy is above 20 degrees, i.e. going into outer space.
At 35 ft, the 3 dB points are 7 and 22 degrees with the vast
majority of the energy falling in the range of angles supported
by the ionosphere. I see NO BENEFIT in going lower than
35 ft on 10M.
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