[TowerTalk] TH-7

[Peter Voelpel]

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 at contesting.com] On Behalf Of David
Gilbert
Sent: Freitag, 3. September 2021 23:16
To: towertalk at 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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