Rather than try to duplicate a design that is decades old, I think it
would make more sense to redesign the antenna using loading coils.
VE6WZ has some loading coil information on:
https://www.qsl.net/ve6wz/index.html
John KK9A
Richard (Rick) N6RK wrote:
The problem is that you don't know the required inductance
of the coils. It would be difficult to determine this
for anyone but M2. At one time, W6ANR used to sell
coils for 40 meter Yagis. Perhaps he has the values
and would be willing to give them to you.
The recent TT thread about determining the resonant frequency
of Yagi elements would help you. You could find the 4
resonant frequencies of the 4 elements of the unmodified
Yagi, and then use trial and error to tune the inductors
to get the same element frequencies. Seems like a lot
of work.
Rick N6RK
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