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Heinrich Rudolf was able to conclusively prove transmitted airborne electromagnetic waves in an experiment.
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Guglielmo Marconi built the first wireless telegraphy based on airborne Hertzian Waves.
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Brazilian priest Roberto Landell de Moura transmitted his voice for the first time ever for approximately over a half mile radius.
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The first purpose-built radio factory was built in 1990.
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The first news broadcast was broadcast from Detroit, Michigan by 8MK. It is still running today. It's known as WWJ.
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Single sideband and frequency modulation were made by amateur radio operators, and by the end of the 30's it was an established commercial mode.
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AT&T commercialized the Mobile Phone Service. They introduced it to 100 towns and highway corridors. It was a rarity at the time and only about 5,000 people had it.
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Sony created a pocket sized transistor radio. It was powered by batteries. It had no vacuum tubes to burn out either.
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Color television was being broadcast commercially. Although not all TV was in color.
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This became the premier radio navigation system.
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The U.S. Navy experimented with satellite navigation, culminating in the launch of the Global Positioning System (GPS) constellation in 1987.
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1994, the U.S. Army and DARPA launched an aggressive, successful project to construct a software-defined radio that can be programmed to be virtually any radio by changing its software program.
