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It is likely that the first intentional transmission of a signal by means of electromagnetic waves was performed in an experiment by David Edward Hughes around 1880.
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In 1896, Marconi was awarded British patent and in 1897 he established a radio station in England.
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By the end of the decade, they were established commercial modes.
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In 1947 AT&T commercialized the Mobile Telephone Service. became a service to 1 in 100's of towns
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In 1954, the Regency company introduced a pocket transistor radio, the TR-1, powered by a "standard 22.5 V Battery."
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In 1963, color television was being broadcast commercially (though not all broadcasts or programs were in color)
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in the 70s, loran 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.
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Adam Curry and Dave Winer are credited with the invention of podcasting which can be accessible online and on cell phones
