For 50 years, radio dominated the airwaves as the first mass medium. Ken Burns examines the lives of three men who shared the responsibility for its invention and early success.

The eighth documentary from acclaimed filmmaker Ken Burns, this one focuses on the fascinating history of American radio, which has dominated the airwaves for 50 years. It also traces on the three founders of the medium: Lee deforest, Edwin Howard Armstrong and David Sarnoff. Narrated by Jason Robards.