In 1966, Broun was hired by CBS, where he began working, as a color commentator, for the Triple Crown of Thoroughbred Racing alongside Jack Whitaker, staying, for two decades, for a wide variety of sporting events.

[1] Along with his long-time producer E. S. "Bud" Lamoreaux, he became a permanent fixture from the initial broadcast in January 1966 of the Saturday edition of the CBS Evening News with Roger Mudd.

Starting with Lombardi and Namath in Super Bowls I and III, moving on to Ali and Frazier, along with DiMaggio and Ted Williams and "the Miracle Mets," and Russell and Cousy and Wilt Chamberlain, and Nicklaus and Secretariat and Ruffian, Broun also contributed some distinguished reporting from the Mexico City and Munich Olympics where he reported on important world events like the "Black Power salute" of the American sprinters John Carlos and Tommy Smith at the playing of the National Anthem in 1968 and the terrorist attack on the Israeli wrestling team in 1972.

Broun also took a lap in a racing sports car with Britain's Stirling Moss, showed up as the coxswain of the Harvard crew as they prepared for their annual battle on the Thames River in New London, Connecticut, with arch-rival Yale, and was run over by a wild horse at the American Indian rodeo in Oregon, after which he tracked down an American original, "Buckskin Bill" Hart, who was living a hermit's life at the confluence of the Salmon River and Wildhorse Creek, somewhere near a remote dude ranch in Mackey Bar, Idaho.

Broun hosted The Literary Guild's First Edition, a nationally syndicated radio show devoted to authors and books, produced by Cinema Sound Ltd., New York beginning in 1973.

Guests included Pete Seeger and Josh White; Robert Kimball, Bill Bolcum, Max Morarth and Dan Morgenstern; Donald Bogle and Rosalind Cash; Kurt Vonnegut; Joyce Maynard and Jeff Greenfield; Penelope Gilliat, Herman Weinberg and Howard Koch; Günter Grass; and Bob Woodward and Carl Bernstein.