I think WTHZ currently uses theirs for simplex communications with their remote crews. A lot of FM stations set up their SCA's to do that back in the days when FM's raison d'etre in small markets was to broadcast high school athletics.
When I worked for WUNC-FM (about 32 years ago), they used SCA to relay transmitter readings back to the studio.
Unless they got rid of it in the past five years or so, WPEG uses their SCA to deliver Capitol Background Music over most of western NC. WKQC used to do the same with Muzak back when they were WEZC. WLNK may still be using theirs to relay the Tarheel Sports Network. WFAE may still be using SCA for the Radio Reading Service run by Central Piedmont Community College.
Does anyone know if FM's have to give up their SCA's when they go digital?
Later . . . .