Radio became widely used in the early 1930s. While the first commercially licensed station, KDKA in Pittsburgh, began broadcasting in November 1920, it took about a decade for radio to move from a hobbyist novelty to a household fixture. A majority of U.S. households owned a radio by 1931, and by 1950, ownership had reached 95 percent.
The First Broadcast and the 1920s Boom
On November 2, 1920, announcer Leo Rosenberg read presidential election returns over the airwaves from KDKA, the world’s first commercially licensed radio station, operated by Westinghouse in East Pittsburgh, Pennsylvania. He even asked listeners to write in and let the station know how far the signal was reaching. That broadcast is widely considered the starting point of commercial radio.
Throughout the early 1920s, radio was mostly a hobby. Enthusiasts built crystal receivers from magazine instructions for just a few dollars in parts. These simple sets needed no power source but could only pick up nearby stations through headphones. By the mid-1920s, battery-powered tube sets became available for $10 to $75, and by the late 1920s, plug-in console models that looked like furniture filled department store catalogs at prices between $75 and $200. Premium models could exceed $400, roughly equivalent to several thousand dollars today. A high-end 1929 RCA set, for example, sold for $179, which translates to about $2,430 in modern money.
Radio was growing fast, but it was still far from universal. Sets were expensive, reception was unreliable, and the airwaves were a mess of overlapping signals with no one coordinating who broadcast on which frequency.
How Regulation Cleared the Way
By the mid-1920s, the lack of rules was creating real problems. Stations broadcast on whatever frequency they chose, causing interference that drowned out competing signals. The Radio Act of 1927 addressed this by declaring that all airwave access had to be authorized by the federal government according to “public interest, convenience, or necessity.” A new Federal Radio Commission decided which stations could use which frequencies, how much power they could transmit, and when they could be on the air.
This framework brought order to the dial and gave listeners a reason to invest in a radio. You could now tune in to a specific station and expect to hear it clearly. That regulatory structure, later administered by the Federal Communications Commission, remains the basis for how the U.S. manages its airwaves today.
The 1930s: Radio Becomes a Mass Medium
The 1930s were when radio truly saturated American life. A majority of households owned a set by 1931, and programming became far more sophisticated. Stations organized their schedules into fixed quarter-hour and half-hour blocks, and distinct genres emerged to fill every part of the day. Soap operas like “Ma Perkins” and “The Guiding Light” aired in the afternoons. Children tuned in after school for adventure serials like “Little Orphan Annie” and the science-fiction show “Flash Gordon.” Crime dramas like “The Shadow” built loyal followings, and the situation comedy “Amos ‘n’ Andy” became the most popular show ever broadcast, running for more than 30 years.
Live music was a staple. Big bands led by Artie Shaw, Benny Goodman, and Tommy Dorsey played dance music from ballrooms in New York and Chicago, carried by network affiliates to listeners across the country. Prestige anthology shows brought together Hollywood actors and serious writers for live dramatic performances.
Radio also became the primary channel for news and politics. Events like the Lindbergh baby kidnapping and the Hindenburg disaster captured national attention in real time. President Franklin D. Roosevelt used the medium to speak directly to Americans through his “fireside chats.” According to the Hooper radio ratings service, nearly 54 million people tuned in to one of those broadcasts, out of roughly 82 million American adults. That kind of reach was unprecedented for any medium.
World War II and Peak Influence
The early 1940s pushed radio even further into the center of daily life. World War II made network news essential, as local stations depended on overseas correspondents to report from the front lines. Young reporters like Edward R. Murrow, William Shirer, and Walter Cronkite became household names by covering breaking wartime events. Commentators analyzed developments on the home front. For millions of families, the radio was the only source of timely information about a global conflict.
This era, stretching from the early 1930s through the late 1940s, is often called the Golden Age of Radio. It was the period when radio served as the dominant mass medium in the United States, filling the role that television, the internet, and social media would later take turns occupying.
Television, Transistors, and Radio’s Reinvention
Radio’s dominance began to fade in the 1950s. In 1950, only 9 percent of American households had televisions, but by 1959 that figure had jumped to nearly 86 percent. By 1960, average daily household radio listening had dropped to less than two hours, while TV viewing climbed past five hours per day and continued rising. Television had clearly taken over as the primary home entertainment medium.
But radio didn’t disappear. It adapted, in part because of a technological leap: the transistor. The Regency TR-1, released in 1954, was the first commercial transistor radio. Previous portable radios relied on vacuum tubes that were bulky, fragile, and drained large heavy batteries. Transistor radios, by contrast, fit in a shirt pocket, weighed half a pound or less, and ran on standard flashlight batteries. That portability changed how people used radio entirely. You could take it to the beach, the park, or your bedroom. Radio shifted from being the thing a family gathered around in the living room to something personal and mobile.
FM radio also reshaped the medium’s future, though it took decades. Engineer Edwin Armstrong demonstrated a practical FM system as early as 1933, but RCA’s president ultimately abandoned it because it required too radical an overhaul of existing radio infrastructure. Armstrong eventually launched his own FM system, and FM slowly gained ground, eventually becoming the standard for music broadcasting thanks to its clearer sound.
By the 1960s, radio had settled into the role it still largely occupies: a companion medium for driving, working, and background listening, rather than the centerpiece of home entertainment it had been during its golden decades.