On January 5, 1975, Ronald Reagan completed two terms as governor of
California, and soon thereafter he began taping his nationally syndicated
radio program. Between January 1975 and October 1979, with the exception
of a brief interlude to compete for the Republican presidential nomination
in 1976, the former governor delivered three-minute commentaries that were
broadcast every week by approximately 300 U.S. radio stations, reaching an
audience of between 20–30 million listeners.