Mutual Broadcasting System

The Mutual Broadcasting System (commonly referred to simply as Mutual; sometimes referred to as MBS, Mutual Radio or the Mutual Radio Network) was an American commercial radio network in operation from 1934 to 1999. In the golden age of U.S. radio drama, Mutual was best known as the original network home of The Lone Ranger and The Adventures of Superman and as the long-time radio residence of The Shadow. For many years, it was a national broadcaster for Major League Baseball, the National Football League, and Notre Dame Fighting Irish football. From the 1930s until the network's dissolution in 1999, Mutual ran a respected news service with news and commentary programs. In the 1970s, Mutual pioneered the nationwide late night call-in talk radio program, introducing the country to Larry King and Jim Bohannon.

In the 1970s, Mutual launched four sister radio networks: Mutual Black Network, Mutual Cadena Hispánica, regional outlet Mutual Southwest Network, and Mutual Progressive Network. For decades, Mutual had the largest number of affiliates but an uncertain financial position. For the first 18 years of its existence, Mutual was owned and operated as a cooperative. Mutual's member stations shared their own original programming, transmission and promotion expenses, and advertising revenues. From December 30, 1936, when it debuted in the West, the Mutual Broadcasting System had affiliates from coast to coast.