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Re: [TowerTalk] Good vacation antenna

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Good vacation antenna
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Thu, 3 Jul 2025 13:56:04 -0700
List-post: <mailto:towertalk@contesting.com>
On 7/3/2025 1:23 PM, David Gilbert wrote:

My suggestion would be the Chamelion SS25 25' extendable whip together with this mount clamped to the side of the tongue of your trailer.  Put a ground screw in the tongue if it's painted.  If your transceiver doesn't have a tuner the one below works fine.

https://www.dxengineering.com/parts/cha-ss25
That looks like a great solution, Dave! I strongly suggest against a loading coil for 40M, using a tuner built into the radio instead, with or without some top loading. Loss in short lengths of decent-size coax on 40M is pretty low, even with significant mismatch. An excellent study in QEX about ten years ago showed that inductive loading at the base greatly reduces the radiation efficiency, because it's at the current maxima! The study included the construction of multiple configurations of loading, and very rigorous measurements.

73, Jim K9YC

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