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Re: [TowerTalk] Tribander Spacing

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Tribander Spacing
From: Jim Lux <jimlux@earthlink.net>
Date: Fri, 20 Feb 2015 19:34:00 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 2/20/15 6:54 PM, Bill via TowerTalk wrote:
Agreed it runs into trouble with spacings less than .5  wavelength.
However, I have found that performance in the real world seems  to be on the 
money
for spacings greater than .5.


when you get closer than half a wavelength (maybe even farther if the Yagi is particularly high directivity), then the near fields of the two antennas interact, which HFTA does not model. NEC is your friend in that case.


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