In article .com,
wrote:

Anyone ever get around the VHF FM vertical yagi feedline routing
problem by voltage feeding the bottom of the driven element with a stub
like a J-pole? A quick EZNEC run seems to indicate that it's not a bad
idea.

I do recall seeing one design for a "Jagi" - a three-element vertical
beam in which all three elements were of the copper-pipe J-pole style
of construction. It was reported to work pretty well. I'm afraid I
no longer have a reference to the design... sorry.

So it seems like it might work OK... but I wonder if anyone has
actually done it. Would you expect a coaxial stub to work better than
a parallel wire stub in terms of preserving the pattern of the yagi?

My guess is that either could work. For the parallel-wire/pipe stub,
it might be best to use the time-honored trick of making a half-wave
coaxial balun, attaching it a bit higher than you'd do for a direct
coax attachment, and insulate the bottom of the stub from its mast.
Adding a ferrite or coiled-coax choke to the feedline might also be a
good idea.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
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