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Re: [TowerTalk] Modelling a basic stack

To: Bill Tippett <>,
Subject: Re: [TowerTalk] Modelling a basic stack
From: Pete Smith <>
Date: Mon, 10 May 2004 07:25:54 -0400
List-post: <>
At 10:51 PM 5/9/2004, Bill Tippett wrote:
        Bert, I would first use YO7 to optimize the
antennas in their free space stacked configuration.
YO7 already has the A50-5S in the database so it is
simply a matter of selecting it and the stacking
distance you want to try.  YO7 is still available
and is supported by K6STI.  Brian can be reached at where AC is the new Morse symbol for @.

        Once you've optimized the F/R, Gain and SWR
performance as a stack, you can then use N6BV's
HFTA program included in ARRL's 20th edition of
the Antenna Handbook to model different stacking
heights over your actual terrain.

This raises a question. I have always had the impression that antennas in an HF stack, even if first optimized in free space at the planned stacking distance, would be de-optimized (is that a word?) once returned to the "above ground" environment, because the ground plane also figures in the performance of each antenna, and the antennas are different distances from it.


73, Pete N4ZR
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