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St Louis County, Missouri MO Scanner Frequencies and Radio Frequency Reference In 1895, Guglielmo Marconi developed a radio wave based communication system, demonstrating that morse code signals could be sent over long-distances and, by December 1901, across the Atlantic ocean. On November 2, 1920, the first commercial radio broadcast was transmitted by Westinghouse Electric and Manufacturing Company in Pittsburgh, under the call sign KDKA featuring live coverage of the Harding-Cox presidential election. Synthetic aperture radar – a specialized airborne radar set that produces a high-resolution map of ground terrain. The radar is mounted on an aircraft or spacecraft and the radar antenna radiates a beam of radio waves sideways at right angles to the direction of motion, toward the ground. In processing the return radar signal, the motion of the vehicle is used to simulate a large antenna, giving the radar a higher resolution. The program of the vast majority of broadcasters is offer