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Re: [TowerTalk] Stacking 204BA's

To: "Bill Tippett" <>,<>
Subject: Re: [TowerTalk] Stacking 204BA's
From: "Bob Maser" <>
Date: Tue, 6 Mar 2007 20:51:01 -0500
List-post: <>
I agree with you but I am in the process of optimizing a 205BA, which, as 
you know, has a 34 foot boom.  I can get better numbers by making it a 4 
element than leaving it as a 5 element, and boy, can I get better than the 
original 205BA numbers using YO 6.5.  BTW, can you tell me what differences 
are there between 6.5 and 7.0?  I have not been able to find a copy of 7.0 
and I can only make my 6.5 work on an old computer that I keep around simply 
for running YO.

----- Original Message ----- 
From: "Bill Tippett" <>
To: <>
Sent: Tuesday, March 06, 2007 8:40 PM
Subject: [TowerTalk] Stacking 204BA's

> W6TR:
> >Now, if you did away with the dual driven element
> and make it into a 4 director antenna it would really play.
> >I was trying to say was that I found that I
> could get more performance out of my KLM by eliminating
> the dual driven element in favor of a single driven element
>         Bob we have a different definition of "really
> play".  Gain is primarily a function of boom length.
> Changing the feed system has little to do with that.  The OWA design
> uses 2 elements for broad-banding even
> though only one is driven whereas KLM uses two actively
> driven elements.  The net result is that gain will
> be very similar if both antenna styles are optimized
> in a program like YO using identical input parameters
> (boom length, bandwidth, parameter weightings, etc.)
> Before the days of NEC modeling, I remember Telrex
> advertised their 6 element 20 on a 46 foot boom having
> *significantly* (i.e. dB...not tenths of a dB) more gain
> than a 5 element 20 on the same boom.  Now we know that
> is simply not true.  The only way to get significantly
> more gain in a properly optimized antenna is by using
> a longer boom.
>                                         73,  Bill  W4ZV
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