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Re: [TowerTalk] Stacking Tribanders

Subject: Re: [TowerTalk] Stacking Tribanders
From: "Lux, Jim" <>
Date: Tue, 21 Jun 2022 14:52:20 -0700
List-post: <>
On 6/21/22 1:06 PM, John Langdon wrote:
It can tell you how each antenna will do individually but does not calculate 
the combined patterns exactly.

73 John N5CQ

-----Original Message-----
From: TowerTalk <> On Behalf Of David Gilbert
Sent: Tuesday, June 21, 2022 1:01 PM
Subject: Re: [TowerTalk] Stacking Tribanders

HFTA should never be used to try to optimize stacking distance.  It simply does 
not actually calculate the stacking gain as a function of stacking distance 
like EZNEC would.

Dave   AB7E

I'm not sure the "transform to a single antenna at the mid distance" is universally valid - that is, two antennas will have their own set of lobes and nulls, and the combination of those will vary with the phasing and weight of the two antennas.  I'm not even sure it's valid if the only case considered is summing equal amplitudes in phase.

You could probably do HFTA on each one individually, and then work up an Excel spreadsheet to combine them.


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