 He also hosts the "Overdrive Top Ten Countdown," a weekly one-hour country music countdown geared toward truckers, in syndication.Mack left WBAP to join XM Satellite Radio on its Open Road channel (XM 171).Two of the other main personalities on Open Road, Dave Nemo and Dale "The Truckin' Bozo" Sommers, were Mack's primary competitors before all three left their AM radio stations to join XM.