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Re: [TowerTalk] Vertical dipole other choices?

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Vertical dipole other choices?
From: jimlux <jimlux@earthlink.net>
Date: Tue, 20 Oct 2020 12:07:37 -0700
List-post: <mailto:towertalk@contesting.com>
On 10/20/20 11:10 AM, amfone via TowerTalk wrote:
  But if its a vertical positioned  dipole it does not need a counter poise or 
radials as its a dipole. A vertical dipole has a pattern and low take off angle like 
a true vertical but the feed line must come away from the center at a 90 degree 
angle for best performance for several feet.

Or as is done in some antennas, down the inside, with a good choke. 10-15 ft of decent coax won't introduce that much loss with the matching network at the base.

I think the key would be to keep the active length less than around 3/4 wavelength at the highest frequency of operation to keep the feedpoint impedance not too high. So on 10m, that would be 7.5 meters which is about 25 feet.

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