Congress passed the Radio Act of 1912, the first major U.S. law to regulate radio transmissions. It required radio stations and operators to be licensed, mainly to reduce interference and improve safety communications. This early legal framework later shaped how broadcast radio could grow as a business.
The Radio Corporation of America (RCA) was created as a major U.S.-controlled radio company, bringing together assets and patent rights tied to wireless communications. As RCA grew, it became central to manufacturing receivers and organizing broadcasting ventures. This corporate consolidation helped push radio from experimentation toward mass consumer markets.
Westinghouse’s Pittsburgh station (later known as KDKA) received a U.S. Department of Commerce “Limited Commercial” license and the call sign KDKA. While not yet a modern “broadcast license” category, this license is widely treated as a key step toward commercial broadcasting. It positioned the station to use regular programming as a way to build demand for radio receivers.
KDKA aired results from the U.S. presidential election, showing how radio could deliver breaking news faster than print for people with receivers. The broadcast became a highly visible example of scheduled programming designed to attract listeners. This kind of attention helped turn radio into a consumer product—and a platform that could later support advertising.
The U.S. Department of Commerce adopted regulations that formally recognized a broadcasting station category. The rules set aside one wavelength for entertainment broadcasts and another for market and weather reports. By assigning shared “lanes” on the dial, the government tried to reduce chaos and interference as the number of stations rapidly grew.
Secretary of Commerce Herbert Hoover convened a major conference on radio regulation to address technical and policy problems created by rapid station growth. Participants debated issues like interference, licensing authority, and standards for broadcasting. The conference highlighted that voluntary coordination was not enough to manage a crowded airwaves market.
AT&T’s station WEAF broadcast a 10-minute paid message promoting the Queensboro Corporation’s Hawthorne Court Apartments. This “toll broadcasting” experiment showed that airtime could be sold directly, creating a practical revenue model beyond selling radio sets. While not the only early example of paid messages, it is widely treated as a landmark for radio advertising.
The National Broadcasting Company (NBC) began network operations, linking stations to share major programs across cities. Networking made it easier to attract large audiences, which in turn made national advertising more valuable. This marked a shift from many local stations to a system where big companies could distribute content and sell sponsorship at scale.
Talent agent Arthur Judson organized a network of stations called United Independent Broadcasters. The goal was to create another distribution path for programs and performers outside NBC’s growing system. This effort soon evolved into what became the Columbia Broadcasting System (CBS), strengthening competition in network radio.
President Calvin Coolidge signed the Radio Act of 1927, establishing the Federal Radio Commission (FRC). The law strengthened federal authority to assign frequencies and grant or deny licenses using the standard of “public interest, convenience, or necessity.” This was a major turning point: commercial radio could expand, but under stricter licensing rules.
The network backed by Columbia Phonograph (soon known as CBS) began broadcasting with a flagship connection through station WOR and multiple affiliates. This showed how quickly network radio was becoming a two- (and later multi-) network industry, competing for stations, talent, and sponsors. Competition pushed more standardized schedules and higher production values, which helped expand advertising-supported radio.
The FRC’s General Order 40 took effect, requiring most stations to move to new frequencies. The reallocation reduced interference and created a clearer hierarchy of “clear,” “regional,” and “local” channels. By making reception more reliable, it supported the continued growth of commercial stations and national advertising.
The Communications Act of 1934 replaced the FRC with the Federal Communications Commission (FCC), creating a permanent agency to regulate interstate communications by wire and radio. The act carried forward core ideas from 1927, including public oversight of licensing. This completed the shift from an experimental marketplace to a mature commercial radio system governed by long-term federal regulation.
Rise of Commercial Radio in the United States (1920–1935)