Bill Bradley, 82, radio disc jockey in Detroit, New York and at KMPC in Los Angeles. Born William Silbert in Detroit, Bradley began his career there. He went on to New York and radio station WMGM, where comedian Milton Berle gave him his professional name. He originated a televised dance show for teenagers presented weekly from Palisades Park in New Jersey. Moving to Los Angeles, he was a disc jockey at KMPC and later a radio advertising salesman. On Friday in Palm Desert.