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[TowerTalk] "Half-Loop" Antenna?

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Subject: [TowerTalk] "Half-Loop" Antenna?
From: (Jon, W4ZW)
Date: Tue, 16 Jun 1998 11:03:14 -0400

snip > The Antenna Compendium describes some experiments  with the
"Half-Loop" antenna which is a half of a full loop
> antenna fed against a ground screen.

> I have had good luck with full-wave loops in the past, but
> height and size have prevented trying such on 80m or 160m.
> I am curious if anyone has experience with this type of antenna?
This configuration is often referred to as a "travelling wave" antenna and
the results can be quite good.  I used this type for a few years with a
matching unit at the ground feedpoint which also included several ground
radials.  The apex was at 80 feet in a tall pine and the other end I
terminated with a 50 ohm resistive load into a long ground rod with again
several random radials.  The SWR is of course 1:1 on all bands since any
reflected power is simply
dissipated into the far ground.

This antenna was about 580 feet long in my backyard (had 3 1/2 acres) and
was HIGHLY directive!  since it operated as several wavelengths on the
higher bands.    I would often work East Europeans with very strong signal
reports and they often commented that I was one of the stronger signals out
of the SE US especially during the opening and closing of the bands. It
performed very much as a Rhombic I later installed.

I also constructed a smaller version that was only 130 feet long and it
worked quite well.  It was also a very quiet antenna.  The instructions for
this antenna are in the ARRL Antenna book.

Only caveat. . . in Florida it was very susceptible to induced voltages from
nearby lightning so protect your rig.

Jon, W4ZW

> 73, Brian
> --

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