Hi Vasile,
The best discussion I have seen about stacking is at Directive Systems:
http://www.directivesystems.com/ .
The App Note is at http://www.directivesystems.com/STACKING.htm
This is really about VHF stacking -- but the theory would work for your 6M
yagi over the A3S.
73 -- Larry -- W1DYJ
----- Original Message -----
From: "VASILE POP" <yo5bzz@gmail.com>
To: <sales@astronwireless.com>; <N3IZN@aol.co>; <G3SEK@ifwtech.demon.co.uk>;
<cupido@mail.ua.pt>; <rrehr@EPIX.NET>; <beaton@wintermute.co.uk>;
<owner-vhf@w6yx.stanford.edu>; <ns4w@qsl.net>; <MOON-NET@VM.STLAWU.EDU>;
<towertalk@contesting.com>; <mgef@brownell.com>; <K6myc@aol.com>
Sent: Thursday, June 10, 2010 10:29 PM
Subject: [TowerTalk] Stacking yagis
> Hi!
>
> I will erect a 15m high crank down antenna mast.
>
> I want to put a 20m Cushcraft A3S and a 3 element Yagi for 6m
>
> I would like to stack a 6m beam above a 20m beam,
> but can't find any data on what the mininium distance should be.
> Does anyone have any suggestions on where I might find some info or on
> what
> the spacing should be?
> Many Thanks
>
> VA6POP
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