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@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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