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propagation × 141hf × 39
antenna × 28
vhf × 9
uhf × 9
theory × 7
antenna-theory × 6
rf-power × 6
ionosphere × 6
sunspots × 6
physics × 5
wire-antenna × 4
frequency × 4
modes × 4
range × 4
earth × 4
space-weather × 4
rfi × 3
antenna-system × 3
dipole × 3
repeater × 3
satellites × 3
vertical-antenna × 3
equipment-design × 3
wifi × 3