Chattanooga’s oldest radio station, WDOD, has ended its 11-month experiment with progressive talk radio. At 10 a.m. this past Monday, the station switched to a format featuring musical oldies and standards from the late 1950s and the 1960s and 1970s, according to Danny Howard, director of programming and operations for WDEF and WDOD. The new format, which is locally controlled, is known around the station as Ruby AM 1310. Who’s Ruby? “It’s kind of funny,” Mr. Howard said with a laugh. “When we started talking about doing this, it turned out that everybody had an Aunt Ruby or a grandmother...