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Re: [TowerTalk] vertical antenna feedpoint

To: towertalk@contesting.com
Subject: Re: [TowerTalk] vertical antenna feedpoint
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Sun, 16 Mar 2025 20:28:48 -0700
List-post: <mailto:towertalk@contesting.com>
On 3/16/2025 6:53 PM, john@kk9a.com wrote:
I have been doing the opposite for decades.  I shorten the vertical slightly
and use a hairpin coil to create a 50 ohm feedpoint.  Is one method better
than the other?

Good question, John! I have no idea. But I think the answer might lie in current distribution. We know, for example, that loading coils at a low-Z point in the antenna reduce radiation efficiency because it's a current maxima and inductors don't radiate.

73, Jim K9YC

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