[Elecraft] [OT] end-fed halfwave antennas

[Gil]

Hello,

I wouldn't bother with a J-Pole type antenna for HF. The only one I made
remotely close was a Slim Jim for 6m, with ladder line. It worked well.
Making an UNUN for an end-fed is much simpler. All it takes is one
toroid and one capacitor if you want it to be adjustable.

My favorite portable antenna now is a 9:1 EARCHI UNUN, a 19ft wire and a
6m fishing pole. It's not a half wave but it works well down to 40m. If
I can find a tree then I throw a half wave wire and tune it with my
Ilertenna end-fed tuner. There is only one "tie-up" point, very
practical and gives me a low radiation take-off angle.

Except for 80m I'm done with horizontal antennas, especially in the
field. It's just too hard to get them high enough and the results are
never as good as an EFHW.

The only instance I would use a counterpoise wire with an EFHW is if my
coax cable (RG-174) is shorter than 25ft. Otherwise it doesn't make any
difference that I can tell.

Gil.

ac5p at sbcglobal.net wrote:
> I know the J-pole is pretty effective for VHF and would think for HF
> also?   If the quarter wave matching stub were somewhat shorter, I was
> thinking the difference could be made up by an inductor or coil at the
> near end?   A secondary link coil approximately equal to the impedance
> of the coax feed line should effectively couple the RF to the stub and
> EFHW wire?   Some value of inductance coupling should be ideal for a
> good match between coax line and the 1/4 wave matching stub.
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