The wild roller coaster ride is making for a dizzying time for radio stocks. For the second time in three trading sessions, the Dow Jones Industrial Average plummeted more than 500 points, closing down 519 points on Wednesday. The top-5 worst performers for radio included Journal Broadcast Group (JRN), down 18.8%, Saga Communications (SGA), down 12%, Westwood One (WWON), off 11%, and Entercom (ETM) and Disney (DIS) both down 9%. Even worse, some companies lost a sizable chunk of their overall market value since Monday. Entercom closed on Wednesday at $6.35, less than half of its $13.08 closing price on February 28. Journal Communications shares are at the front of the roller coaster. Journal shares reached $4.83 on Monday morning before closing at $4.25; they spiked on Tuesday at $4.65 before plunging to $3.61 and then skyrocketing to close just 60 minutes later at $4.88; and on Wednesday they lost over 18% to close at $3.96. Emmis Communications (EMMS) continues to flounder. Emmis was a $1 stock on August 1, and just 10 days later closed at just 67 cents. You can track all of these stocks here.