[TowerTalk] Adding 15 meters to a 204BA

[Leeson]

Modeling of the HyGain element clamp is derived in Chapter 9 of my 1992 
book, "Physical Design of Yagi Antennas,"
https://www.dropbox.com/s/hmhkeofz0igrg1e/Physical%20Design%20Of%20Yagi%20Antennas%20D%20B%20Leeson%20V2.pdf?dl=0

 From page 9.3, the equivalent diameter of the HG204BA clamp is 2.14 
inches. This clamp model is used in K6STI's YO and other Yagi software.

Dave, W6NL/HC8L

On 11/4/25 5:43 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
> 
> 
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk