Like light waves, radio frequency energy tends to travel in a straight line. In the lower frequencies, radio waves that shoot skyward bounce back from electrically charged layers of the upper atmosphere, thus clearing the curve of the earth. Most Very High Frequency waves (30 to 300 megacycles) bore right through the upper atmosphere and are dissipated into outer space, so V.H.F. should not travel far beyond the visual horizon.
But as TV antennas sprouted from the nation's rooftops, and radio hams got on the air again after World War II, some curious reports drifted in to puzzle the radio men. No...
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