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1994-05-01
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SUBJECT: Wire antennas- part 3
In this posting I will be discussing some of the different
wire antennas the we use in the amateur world.
These antennas are:
o Long Wire, closing remarks.
The long wire antenna was discussed in the previous
posting. I would recommend this antenna for those
interested in a continued contact postion with a specific
station. Long enough, the longwire can provide very good
signal in the direction of the antenna for fixed
communication.
o Wire Dipole
Simple to make and inexpensive to buy. It's the basic
design for Inverted Vee. Basically a bidirectional antenna
with a balun. Antenna is null of the tips. The dipole is
2.12 dB over isotropic and is and electrical halfwave.
Can be arranged vertically or horizontal. It is a linear
antenna.
o Inverted Vee
This antenna is a dipole with sloping elements. The
antenna is omni-directional for the most part. It's overall
gain is less than a dipole because of the omni pattern.
o Rhombic
This is a rather large antenna. Rhombics can be various
lengths total. In the UHF range, 19 wavelengths is common.
In HF, 4 and up is common. This antenna requires some land
depending on the frequency. A rhombic is good to twice it's
design frequency, directional, and fixed.
o Terminated longwire
Requires some space, but performs well. Directional with
a wider bandwidth than the longwire at shorter lengths.
o Sloping Vee
Similar to the Inverted Vee, the sloping vee is semi-
directional. Easy to install, inexpensive, and easy to build.
o Beverage
Good all band antenna with a tuner. Easy to build and
set-up. Requires some space and not suitable for small lots.
o Marconi
Large antenna requiring some space, but good for the
lower HF bands. Semi-directional, the marconi is easy to
build and cheap to construct.
o Folded Marconi
Cheap and easy to install antenna. Made from 300 ribbon
cable (TV). Set up in a 'hockey stick' form. Use a tuner.
Works well in the 40-160 range. Requires a ground plane.
o Loop
Consists of a full wave length and can be set-up
horizontally or vertically polarized with the antenna in
the vertical position or set-up parallel to the ground for
lower frequencies.
o Sloper
Common design for most hams. Antenna is a slooping dipole
or sloping quarter wave. Easy to bulid and install. Semi-
directional in the direction of the slope.
-WS