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[TowerTalk] 6M-triband spacing

To: <>
Subject: [TowerTalk] 6M-triband spacing
From: (
Date: Sat, 13 Nov 1999 07:36:07 -0600
Hi  Bill,

Lower frequency antenna elements act as inefficient reflectors to
the higher frequency antennas and will skew the vertical pattern 
of the higher frequency antenna.

A good rule of thumb is 0.2 WaveLengths minimum between 
antennas, at the higher frequency.  For 6 meters, this comes to 4 ft.
Of course 6 ft is even better.

Higher frequency antennas are generally (almost) invisible to lower
frequency antennas if the frequency difference is more than 10% or
so, similar to "non-resonant" guy wire lengths.

de  Tom  N4KG

On Tue, 09 Nov 1999 20:08:50 -0600 Bill Aycock <baycock@HIWAAY.NET>
> Opinions wanted
> I have an ATB34 tribander at about 50 ft, mounted on a 2" mast just 
> above
> the tower. There is about 3-4 ft of additional 2"mast above there, 
> and a
> reduced size mast for another 2 ft.  I plan to put a 3el Yagi for 6M 
> on the
> smaller mast section, above the tribander.
> If I just leave the tribander where it is, and put the 6m on the 
> upper
> mast- the range of spacing is about 3.5 to 6 ft.. I can reduce this 
> by
> elevating the tribander, or increase it a little by lowering the 
> tribander. 
> The obvious questions are: 1. what spacing will probably be best.?, 
> 2. is
> there a spacing I sould avoid?, and 3. should I leave the booms 
> lined up or
> put them at 90 deg?
> The ATB34 is an earlier incarnation of the CushCraft 4el Tribander. 
> It
> appears that all the changes were to make it cheaper to build- like 
> leaving
> off the Balun) But this old one  works quite well.
> Thanks for any comments- Bill- W4BSG
> -
> Bill Aycock   ---   Persimmon Hill 
>  Woodville, Alabama, US 35776
>  (in the N.E. corner of the State)
>       W4BSG   --   Grid EM64vr
> --
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