That's a bit oversimplified, Don, because of the very strong effect of
soil conductivity and mounting height on the performance of a vertically
polarized antenna. That's addressed in the app note I referenced earlier.
http://k9yc.com/AntennaPlanning.pdf
And this one.
http://k9yc.com/43FtVertical.pdf
Mounting height and soil conductivity move the lobes around AND vary the
ground losses. There are many combinations that can cause a vertical to
be stronger at high angles (45-60 degrees) than a low dipole. The one
characteristic of verticals is that their radiation goes to zero
straight up.
You don't see these things clearly until you plot patterns for antennas
being compared on the same graph, as I did in those links.
73, Jim K9YC
on On 3/13/2020 6:44 PM, Don Wilhelm wrote:
That means to me that a dipole mounted at a modest height for 160, 80,
and 40 will provide local as well as moderately distant contacts easily.
A proper vertical will provide more DX contacts, and weaken the
receive signals for more close-in stations - it is all in the angle of
radiation - how many miles does the signal travel before it is reflected
by the ionosphere? It is all a matter of physics and geometry.
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