Tuning an antenna close to the ground is a waste of time. You cannot
predict what the SWR will be at your final height.
John KK9A
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Change in Frequency with Height above Ground
From: Bob K6UJ <k6uj@pacbell.net>
Date: Thu, 26 May 2016 20:53:05 -0700
That's interesting Jim. I remember looking at a graph of the impedance
change of a dipole at various heights. It doesn't like being very close to
the ground, hihi.
Don,
FWIW,
With my 2 el 40 meter beam I found that if I tuned it for resonance
suspended at 15 feet above the
ground then it shifted (went up) about 20khz when raised to 90 feet.
Bob
K6UJ
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