TSB / SIRIUS AUDIO MUTES (DROPS OUT) INTERMITTENTLY IN OPEN SPACES - THIS BULLETIN PROVIDES INFORMATION ABOUT THE REPLACEMENT OF THE SHARK-FIN STYLE ROOF ANTENNA OF SOME 2014~2016MY SPORTAGE (SL) VEHICLES, PRODUCED FROM AUGUST 1, 2014 THROUGH AUGUST 31, 2015, AND SOME 2014~2015MY OPTIMA (QF) VEHICLES, PRODUCED FROM AUGUST 1, 2013 THROUGH AUGUST 22, 2015, WHICH MAY EXHIBIT SIRIUS AUDIO RECEPTION CONCERNS (SEE SAMPLE COMPLAINTS BELOW). FOLLOW THE PROCEDURE OUTLINED IN THIS BULLETIN TO REPLACE THE ROOF ANTENNA AND CORRECT THE CONCERN.