Duane and All,
I think the rule of thumb is that you should elevate your antenna at least 1/10
wavelength to see significant improvement in ground losses. So, the higher you
go, the more benefit you would get. On 40 meters, that means you should raise
the antenna at least 12 to 13 feet minimum. You could probably get a better
idea of height vs. benefit if you model the antenna on Eznec or some similar
modeling tool.
Vertical antennas will tend to be directive towards the concentration of
radials. So, if you lay out only 1 radial, it would tend to favor the
direction towards the radial, but only slightly. Don't expect a front to back
similarity like you might have with a beam. The directivity is more a
distortion in the pattern rather than a substantial front to back effect.
Again, modeling would give you a better answer.
Dave W7AQK
----- Original Message -----
From: Duane, WV2B
To: dx-chat@njdxa.org
Sent: Tuesday, September 09, 2008 10:09 AM
Subject: [DX-CHAT] Antenna question
Hi Folks,
I have read that a full size vertical {elevated} with 1 ground radial has
performance equal to ground mounted with 120 buried radials, and is
directional. Question-
How high would a 40 meter version have to raised, and with one radial which
way would it be directional?
Thanks,
Duane, WV2B
"It is one of the most beautiful compensations in life... That no man can
sincerely try to help another without helping himself."-
Ralph Waldo Emerson
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