The MFJ-1779A half-wavelength, single-band dipole is a center-fed antenna that
can be tuned for resonance anywhere in the 160 meter amateur band (1.8-2.0
MHz). It will handle full legal limit power. The dipole is made using number 14
stranded copper wire, a durable center insulator with a SO-239 coax connector,
and is terminated with ceramic insulators. The dipole should be shortened to the
required length, and enough wire is provided for resonance at 1.8 MHz..
CHOOSING A LOCATION
Choose a location as clear as possible from obstructions such as other antennas,
buildings, and power lines. Never place any antenna near power lines. Try to
keep the antenna away from metal structures, which will affect its performance.
The optimum height of any dipole is one-half wavelength of the operating
frequency above ground or higher. This can be calculated in feet by dividing 468
by the frequency in MHz. Optimum antenna height always varies due to
different ground conditions and nearby objects.
The antenna should be suspended using a weather resistant, non-metallic rope.
Always leave a few extra inches in the support rope to allow for wind movement
of the antenna, especially important when trees are used for supports. Dipoles
can be installed in three different ways:
Horizontal: Requires two supports as far apart as the length of the antenna
(about 270 feet for 160 Meters). Because of its length (and consequent weight)
this antenna must also be supported in the middle.
Inverted “V”: A more likely installation for an antenna of this length. The
center insulator should be the highest point of the antenna; tie off the ends to any
convenient points and get the ends of the antenna as high as possible.
Sloped: One end of the antenna is supported as high as possible and the other
end tied off to a support at ground level.