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Re: [TowerTalk] 80 mts four square or yagi?

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 80 mts four square or yagi?
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Mon, 09 Mar 2015 13:53:41 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Mon,3/9/2015 12:28 PM, Stan Stockton wrote:
As has been discussed a 4 Square is hard to beat for simplicity, maintenance 
and quick direction switching.

On the first day of this thread, I posted a link to a study I've done on the effects of ground quality and the effects of mounting height on vertical and horizontal antennas. I STRONGLY urge those saying that one or the other is always better to study it. Nothing could be farther from the truth.

http://k9yc.com/VertOrHorizontal-Slides.pdf

I've given this presentation to three ham clubs, and each time, I've gotten praise from those who know antennas. The performance of ANY vertical antenna is STRONGLY affected by ground quality AND its counterpoise/radial system, while the performance of a horizontal antenna is NOT. The primary determinants of the performance of a horizontal antenna are HEIGHT and TERRAIN.

There is no single answer to Jorge's question. Over poor ground, a high dipole will outperform a 4-square with a great ground system. Over a very good ground, the 4-square will be a winner.

My QTH has lousy ground, so the only band where verticals are better is 160M, and that's because the highest I could put the dipole is 135 ft (a quarter wave, which is LOW for a dipole).

73, Jim K9YC


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