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Since the late 20th century, radio formats have diversified to include various music genres, talk, news, and sports, catering to niche audiences and tastes.

The British Broadcasting Company was founded on October 18, 1922, and later became the corporation known as the BBC. It set standards for public service broadcasting and is the world's oldest national broadcaster.

In the 1950s, talk radio emerged as a significant format. It gave rise to public discourse and listener participation, with call-in shows becoming widely popular.

Established in the early 2000s, HD Radio technology allows for multicasting on traditional FM frequencies, transmitting digital audio and data alongside existing analog signals.

In 1992, the first satellite for radio broadcasting, Digital Audio Radio Service (DARS), was launched, paving the way for subscription-based satellite radio services.

Edwin Howard Armstrong invented Frequency Modulation (FM) radio in 1933 to reduce noise and improve sound quality over Amplitude Modulation (AM) radio. FM radio dramatically enhanced the listener's experience.

With the rise of the internet in the 21st century, online radio and streaming services have become popular, offering global access to an array of radio stations and content.

Spanning the 1920s to the 1940s, this era saw radio becoming a central piece of entertainment and information in households, influencing culture and politics. Shows ranged from comedies, dramas, to news programs.

During WWII, radio was a critical medium for propaganda, entertainment, and information, strengthening its position as the dominant mass media of the time.

The first radio broadcast aired on November 2, 1920, by station KDKA in Pittsburgh, featuring the Harding-Cox presidential election results. This event marked the start of scheduled public radio broadcasting.

On October 30, 1938, Orson Welles' radio adaptation of 'The War of the Worlds' caused public panic as some listeners believed it was a real alien invasion. This highlighted the influence of radio on the public.

Pirate radio stations, widespread in the 1960s, operated without a license and often aboard ships. They challenged government control of broadcasting and influenced music and culture.

On December 11, 1921, the first transatlantic radio broadcast was made from Greenwich, Connecticut, to Ardrossan, Scotland. It was an important milestone in international communications.

Guglielmo Marconi is credited with inventing radio in the 1890s. His work on wireless telegraphy marked the beginning of modern radio communications. Historical significance includes the transformation of long-distance communication.