The astonishing story of America's airwaves, the two friends--one a media mogul, the other a famous inventor--who made them available to us, and the government which figured out how to put a price on air.

This is the origin story of the airwaves--the foundational technology of the communications age--as told through the forty-year friendship of an entrepreneurial industrialist and a brilliant inventor.

David Sarnoff, the head of RCA and equal parts Steve Jobs, Jack Welch, and William Randolph Hearst, was the greatest supporter of his friend Edwin Armstrong, developer of the...