[Top] [All Lists]

[TowerTalk] 80M dipoles/height gain

To: <>
Subject: [TowerTalk] 80M dipoles/height gain
From: (Tom Rauch)
Date: Mon, 23 Jul 2001 10:34:16 -0400
> The 6-12 degree region contains the first arrival angle distribution
> peak. It takes a dipole at 160' to put much energy there.  A vertical
> isn't the answer to cover these lower angles -- unless you have excellent
> ground conductivity.  EZNEC shows that verticals are also poor performers
> at these angles there in areas of conductivities in the 2-5 range (my QTH
> is 2.5.)  Of course, if your vertical antenna is on a salt marsh, you win.

Modelling prompted me to install a 318 ft tower, and that probably 
was one of the worse investments I ever made. But hey, if you don't 
try one you never know. Don't sell a vertical short without trying 
one, at least not on the lower bands where things may work out 
better than you expect! 

On 1.8MHz, I have a dipole at ~300feet. At best it just ties a series-
fed 200ft tower. Most of the time the 200ft tower is better, and 
that's true at any distance!

My soil does not seem to be particularly good, it is clay with a thin 
layer of sandy topsoil although this is gentle rolling pastureland and 

On 80 meters at my old QTH near Atlanta, a 35 foot top loaded 
vertical with 60 80 foot radials tied or beat a 100-120 foot high 
dipole into Europe night after night. 

I hope to have an 80 meter vertical up here someday to test against 
my 160 foot high dipole. Of course I always use real ground 
systems with lots of radials.
73, Tom W8JI 

List Sponsor: Are you thinking about installing a tower this summer? Call us
for information on our fabulous Trylon Titan self-supporting towers - up to
96-feet for less than $2000! at 888-833-3104 <A 

FAQ on WWW:     
Administrative requests:

<Prev in Thread] Current Thread [Next in Thread>