Figure 52.
GROUNDED ANTENNAS
1.
Quarter-Wave Antennas.
a. In our previous discussion of the ground reflected wave, we
determined that at medium and high frequencies, the ground plays an
important part in re-enforcing the direct wave. If the ground is of
high conductivity, we can make our antenna a quarter-wave length
instead of a half-wave in length. By driving a ground rod into the
earth and attaching our equipment to the rod, the earth becomes the
other quarter-wave of our antenna. See figure 53.
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