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Installation of Radials
There is no need to make radials exactly 1/4"
wavelength long for the 18-HT-S Hy-Tower. In
fact, the only case where you should have 1/4"
wavelength radials would be for approximately
90 radials. This differs rather dramatically from
the case of a
Ground-Plane
resonant radials are installed
Since the radials of a Ground-Mounted vertical
are actually on, if not in, the ground, they are
coupled by capacitance or conduction to the
ground, and thus resonance effects are not
important. Basically, the function of radials is
to provide a low-loss return path for ground
currents. The reason that short radials are
sufficient, when few are used, is that at the
perimeter of the circle to which the ground
system extends, the radials are sufficiently
spread apart. Most of the return currents are
already in the ground between the radials rather
than in the radials themselves. As more radials
are added, the spaces between them are
Since the 18-HT -S Hy-Tower is a multi-band,
vertical antenna, the radial system should be
optimized on the lowest frequency you plan to
use. Higher frequencies will benefit equally
from
frequencies
antenna where
ground.
above
To determine the optimum radial installation
for your 18-HTS Hy-Tower, you must first
decide what is the limiting factor for your
1. Cost of radial
2. Land available for radials
3. Efficiency of your antenna
Table 1 shows some various ground system
configurations. System A is the least costly and
the least efficient. System F is the most
expensive, takes the most land and is the most
efficient.
the
ground
will
i
system,
while
not
show
as
lower
much
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