TC 9-64 _________________________________________________________________________
Figure 4-41. Stacked Turnstile Antenna
Ground-Plane Antenna
4-174. A vertical quarter-wave antenna several wavelengths above ground
produces a high angle of radiation that is very undesirable at VHF and UHF
frequencies. The most common means of producing a low angle of radiation
from such an antenna is to work the radiator against a simulated ground
called a ground plane. A simulated ground may be made from a large metal
sheet or several wires or rods radiating from the base of the radiator. An
antenna so constructed is known as a ground-plane antenna. Two ground-
plane antennas are shown in figure 4-42, views A and B.
4-54
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