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…showed last 75 words of 579 total…for short distance overland transmissions. Short waves are reflected off the top of the ionosphere. Low frequency signals have long wavelengths. Low frequency signals from transmitters can reach distant places by repeated reflections between the ionosphere and the ground. Guglielmo Marconi was the first to use radio waves foe a practical signaling system. He made it possible to use the wireless communication technique. He studied how radio waves work and how they can be used.