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Guglielmo Marconi sent the first radio signal.

Marconi transmitted the first transatlantic radio signal.

The first commercial radio broadcast aired.

Edwin Armstrong invented frequency modulation (FM) radio.

The Armstrong FM Radio Controversy and ensuing legal cases.

The first public demonstration of a working transistor radio.

The launch of the first satellite radio broadcast by the United States.

The wide adoption of FM stereo broadcasting.

The Radio Broadcasting Preservation Act was passed in the United States.

XM Satellite Radio launched as one of the first satellite radio services.

HD Radio was officially selected by the US's Federal Communications Commission (FCC) as the digital radio standard.

National Public Radio (NPR) launched its smartphone app.

Norway became the first country to switch off FM radio and move entirely to digital radio broadcasting (DAB).

During the COVID-19 pandemic, radio broadcasters adjusted programming to provide vital news and company to listeners in lockdown.