TC 9-64 _________________________________________________________________________
A type of antenna that uses a ground plane as a
simulated ground to produce low-angle radiation.
The loss of RF energy each time a radio wave is
reflected from the earth's surface.
A series of conductors buried below the surface of the
earth and arranged in a radial pattern. Used to reduce
losses in the ground.
Radio waves that travel near the surface of the earth.
An antenna, consisting of two rods (one-quarter
wavelength each) in a straight line, that radiates
A frequency that is a whole number multiple of a
smaller base frequency.
A half-wave antenna installed some distance above
ground and positioned either vertically or horizontally.
high frequency (HF)
The range of the radio frequency spectrum extending
from 3 MHz to 30 MHz.
On a graph, the straight line axis plotted from left to
The part of a radiation pattern that is radiated in all
directions along the horizontal plane.
Waves that are radiated with their E field component
parallel to the earth's surface.
(1) The wave that strikes the surface of a medium. (2)
The wave that travels from the sending end to the
receiving end of a transmission line.
The electromagnetic field produced about an antenna
when current and voltage are present on the same
The losses that occur when the electromagnetic field
around a conductor cuts through a nearby metallic
object and induces a current into that object.
Sounds below 15 hertz.
The end of a two-wire transmission line that is
connected to a source.