Hi Guys,
I'm at a portable location setting up for Field Day. One of our antennas
will be a 40-meter 1/4 wave ground mounted vertical... with a good number
of radials under it.
The soil is very poor: 6" of sand with gravel under the sand. About as
bad as possible for a Vertical.
Common 1/4 wave Vertical theory often states things like: "radial length
does not effect a Verticals resonance when the vertical is ground mounted".
However, I am finding in with this super poor ground conductivity QTH
that the 1/4 wave Vertical wants 1/4 wave radials in order for the Vertical to
resonate anywhere close to where it should. (with odd length radials, the
Vertical's length must be changed by several feet)
With the above in mind, with this super poor ground conductivity, the
ground mounted vertical behaves more like a Ground Plane antenna. I must
assume this is normal when you have about zero ground conductivity. Is that
how
you see it?
73,
Dick- K9OM
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