[TowerTalk] Adding 15 meters to a 204BA

[Stan Stockton]

John,

Yes, I would prefer he insulate the elements.  Using Hygain element clamps I would probably use the equivalent diameter calculation from YO.  

But first I would see what the effect would be to take a good design for a 20m Yagi and then change the center 8 inches or so (4” either side) from 1.25” or whatever it is to about 3.5” diameter.  I just guessing, having not looked at it yet that it won’t be significant since it is a section that’s lnot more than 3-4% of the total length. 

 If it makes a significant difference he will have to make elements that are insulated. I don’t like guessing.

73…Stan, ZF9CW

> On Nov 4, 2025, at 8:46 PM, john at kk9a.com wrote:
> 
> Maybe easy for you, Stan  I have not done well designing multi-band Yagi's although I have not tried doing so with AutoEZ.  I would be interested in seeing your WEQ file for this.  Hy-Gain uses a large formed aluminum element clamp so you might have to make some guesses for modeling.  Insulated elements are easier.
> 
> GL
> John KK9A
> 
> 
> Stan Stockton K5GO wrote:
> 
> Dave,
> 
> This is pretty easy to do.  Would probably end up being 3 on 20 and 4 or 5 on 15.  The difficult part is inputting exactly what the lengths and diameters you are going to use for each element.  AutoEZ will do the rest of the work using one feedline.
> 
> If you give me the exact lengths and diameters of the first 3 elements on your 20m antenna and same info for what you want to use for the 15m elements, I’ll do it for you.
> 
> No 10 meters?
> 
> Stan, ZF9CW
> 
> Sent from my iPhone
> 
>> On Nov 3, 2025, at 11:40 PM, dave arruzza via TowerTalk <towertalk at contesting.com> wrote:
>> 
>> Has anyone successfully added, non trap, 15 meter elements to a 204ba.
>> 73
>> Dave
>> W1CTN / NC4DARADIO GASTONIA203-906-6209
> 
> 
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