My hat is off to all of you fine gentlemen who contributed to this
discussion.
You have helped me see the light.
I think the reasonable conclusion is that a center fed vertical dipole is
a very difficult thing to make work, especially if the feedline cannot be
brought away from the antenna horizontally for an appreciable distance.
I’m going to try base feeding it with an LC network and see if I can get
better results.
Many thanks to everyone who provided input.
Tom
K0SN
On Mon, Jan 12, 2026 at 6:57 PM Jim Brown <jim@audiosystemsgroup.com> wrote:
> On 1/12/2026 5:23 PM, Jeff Blaine wrote:
> > Tom, I'm emphasizing what Jim mentioned earlier. If the antenna
> > resonant point moved by adding the choke, then that means the feedline
> > was participating to some extent as "part of the antenna."
>
> Yes, but in Tom's configuration, even with the world's greatest choke,
> the feedline can still be a parasitic element.
> >
> > My belief is that without a feedline choke, you simply cannot guarantee
> > that the feedline will not participate. So every antenna here (19 of
> > them) has a feedline choke of some form.
>
> Yes. And feedline chokes also reduce interstation interference, whether
> SO2R or multi.
>
> 73, Jim K9YC
>
>
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