20. Figure 45 represents a--
a.
one-quarter wave antenna.
b.
counterpoise.
c.
doublet antenna.
d.
wavelength.
Figure 45. Illustration for Exercise 20.
21. A forward observer is slightly out of range of the fire direction
section.
The FO decides to fabricate a field-expedient, long-wire,
directional antenna.
The length of this antenna should be no less
than--
a.
one wavelength.
b.
two wavelengths.
c.
three wavelengths.
d.
four wavelengths.
22. When computing the length (wavelength) of a replacement antenna for a
vehicle-mounted radio, you must remember that the vehicular (whip)
antenna is a--
a.
quarter-wave antenna.
b.
half-wave antenna.
c.
full-wave antenna.
d.
horizontally polarized antenna.
23. When necessary to improvise insulators, the best material available in
the field is--
a.
WD-1 field wire.
b.
an empty soft drink can.
c.
dry wood.
d.
a broken antenna section.
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