"Cecil Moore"
If the vertical is much over 5/8WL long, its take-
off-angle is too high for proper operation. 5/8WL
~600/f = 21 feet on 10m. Your 40-45 foot height
would only be good up to about 14.3 MHz unless you
figure out a way to shorten the wire above that
frequency.
____________

Just to note that the peak field _generated_ by a ground-mounted
vertical up to 5/8 wavelength high always occurs in the horizontal
plane. Ground losses for the displacement currents in the earth
gathered by a buried radial network within about 1/2 wavelength
of the antenna will reduce this field from its theoretical maximum
value, but peak relative gain _as radiated_ always will remain
directed in the horizontal plane, regardless of the amount of
those ground losses.

Calculating the "pattern" of a vertical radiator at an infinite
distance from a site on the earth leads one to think that the
radiator produces zero field in the horizontal plane, and that
its maximum field _as it is radiated_ occurs at some higher angle.

But this effect is only due to groundwave propagation losses
related to earth conductivity, the r-f frequency, and earth curvature.
It doesn't mean that the vertical radiator originally produced
zero h-plane field -- just that the higher angle fields were the only
ones to survive the trip to an infinite distance.

If the above was not true, MW commercial broadcast stations
would have essentially no daytime groundwave coverage.
Their nighttime, distant skywave coverage also would be affected,
because much of that is produced by elevation plane radiation
between zero and +10 degrees.

RF

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