CBS News Radio signing off after nearly 100 years: "An American institution"

CBS News Radio, which provides news programming to an estimated 700 stations spanning the United States, will sign off the air Friday night after nearly a century of broadcasting. The storied service, launched in September 1927, was home to broadcast legends Edward R. Murrow , Robert Trout, Douglas Edwards, Charles Osgood, Dan Rather and many other familiar and trusted voices over its decades in operation. "It's been around for a long time. …