The first radios (and transmitters) were home made. In 1920, Horne's department store placed an advertisement in the Pittsburgh Sun heralding the miracle that you could listen to music over the air:
Air concert picked up by radio here. The music was from a Victrola in the home of Frank Conrad. Mr. Conrad is a wireless enthusiast and puts on these wireless concerts periodically for the entertainment of many people in this district who have wireless sets. Amateur wireless sets are on sale here $10 and up. Wired
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