United States

Radio Broadcasting became a reality: Nov. 2, 1920.
By the end of the 20th century’s second decade, three key elements were in place to fuel radio broadcasting: resonant circuitry, a practical means for generating a carrier wave, and methodology for impressing speech and music on that carrier.
These waited only for someone to combine them in an effective way.
A number of individuals — most notably Reginald Fessenden, Lee de Forest and Charles Herrold — had made varying attempts at broadcasting. None took root.
There was little effort to stimulate interest among the public. Early transmissions of speech and music were directed to radio amateurs. There also was little or no notification of how to “listen in.” Nor were there regular operating schedules, nor readily available receivers for the general public. Radio sets were marketed to commercial enterprises, the military and radio amateurs.
This stemmed from the government’s decision not to allow foreign corporations such as Marconi to exert a virtual monopoly in this area of radio, as had been the case before the war. While that chapter in radio history is too involved to relate in detail here, it resulted in the creation of the Radio Corporation of America.
RCA, along with General Electric, a large player in radio communications, wound up controlling most of the valuable radio patents.
Westinghouse attempted to enter into international radio communications, joining with the International Radio Telegraph Co., successor to Reginald Fessenden’s National Electric Signaling Company, in an attempt to secure a place in this field. The initiative failed due to postwar agreements in place by others including Marconi, Telefunken, and RCA, the new kid on the block.
Radio World NewsBytes (2020-10-07)