Indeed, with all 4 antennas in phase, the combined radiation angle of that
system is almost that of the highest antenna alone.
I stacked my 20m 5/5/5 at 147, 85 and 33 feet.
73
Peter
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of David
Gilbert
Sent: Freitag, 3. September 2021 23:16
To: towertalk@contesting.com
Subject: Re: [TowerTalk] TH-7
There are two different effects here in that comparison. One is the
stacking gain for the four stack, but the other is the difference in
takeoff angle for an antenna on 20m at a height of 140' versus 70'.
Attributing all of that supposed 20dB purely to stacking gain is wrong.
Dave AB7E
>
> ## It was on the front cover of a CQ magazine, back in the 80's. He
> stacked em at 35-70-105-140'. With all 4 driven in phase, he was 20 db
> louder than another ham, close by, who had just a single TH-7 up 70'.
> I find that hard to believe, but that was what was reported.
> The article was entitled.... "TH-28".
>
> Jim VE7RF
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