The mysterious and unclaimed signal was a source for much speculation, giving rise to theories such as Soviet mind control and weather control. Because of its extremely high power output (over 10 MW in some cases), the signal became such a nuisance that some receivers such as amateur radios and televisions actually began including 'Woodpecker Blankers' in their design. The random frequency hops disrupted legitimate broadcast, amateur radio, commercial aviation communications, utility transmissions, and resulted in thousands of complaints by many countries worldwide.
It sounded like a sharp, repetitive tapping noise at 10 Hz, giving rise to the "Woodpecker" name. The Russian Woodpecker was a notorious Soviet radio signal that could be sporadically heard on the shortwave radio bands worldwide between July 1976 and December 1989. A backplane reflector of small wires can just be seen left of center, most clearly at the bottom of the image. The array of pairs of cylindrical/conical cages on the right are the driven elements, fed at the facing points with a form of ladder line suspended from stand-off platforms at top right.
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