It is known that the established garden weathervane with propeller with its constant sound and vibration that is transmitted through the pole into the ground, drives away from the area of rodents and moles. And the Scarecrow in the garden is meant to scare off birds — lovers enjoy the juicy fruit and berries.
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In the early 30-ies of the radio Amateurs of the Soviet Union, mastering of ultrashort waves, for the first time faced the necessity of direction finding of radio transmitters. The...
