Comparisons of take-off
angles for various frequencies for the same
antenna height. Notice
that for short distance communication (0-250
miles) only the 3 MHz
frequency has a radiation pattern virtually
straight up. The 9 and
18 MHz frequency will skip over the receiving
station.
TAKE-OFF ANGLE
HALF-WAVE DOUBLET ANTENNA VERTICAL PATTERN, HEIGHT 40 FEET
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