[TowerTalk] Omnidirectional antenna for domestic contests

[Don W7WLL]

Fan dipoles in a V configuration.

Have been considering adding a set of 160 M legs to my 80M inverted V which 
currently is fed 70 feet up off my tower. The legs are in a straight line, 
SE and NW, ending about 12 feet off the ground. Have not been on 160 for 
decades! It performs reasonably well on 80 considering.

If anyone has any experience with a 80-160 fan dipole I'd sure like to hear 
what they were/are. Should I add the legs, they would form more of a V with 
one leg going SW and the other NE, with an included angle between them of 
about 150-160 deg. Ends would probably be also have to be around 12 feet.

Recognizing this is a less than stellar configuration I'd appreciate 
comments on what I might expect from the 160 portion performance wise and 
what problems I might encounter.

When I moved I gave away all my ARRL antenna books and I don't own an 
antenna anaylzer or modeling program so experienced input of others is 
important and welcome.

Don W7WLL

-----Original Message----- 
From: Jim Brown
Sent: Tuesday, October 06, 2015 11:25 AM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Omnidirectional antenna for domestic contests

Hi Herb,

I just modeled a 30M dipole at 50 ft with one leg rotated 45 degrees, 60
degrees, and 90 degrees. Yes, the nulls fill some, but at the expense of
broadside gain. And, of course, it's much trickier to rig, requiring
four supports and/or guys in the good places. Two fans require four
supports, but they can be widely separated.

73, Jim K9YC

On Tue,10/6/2015 5:51 AM, Herbert Schoenbohm wrote:
> Can't the end null of dipoles be mitigated by putting up the dipole in a 
> slight 120 degree V configuration.  Although I have never seen this 
> modeled for HF,  I understand this is how broadcast FM antennas are 
> designed to get an omni directional pattern. The same concept should work 
> at HF as well. Right?

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