The hyphen keeps them apart

I was sitting at a stoplight the other day next to a bus and I noticed the ad on it was for WSNC, Winston-Salem State's NPR station. I thought that was a little strange b/c WFDD is Winston-Salem's NPR station. I checked out the WSNC schedule and there wasn't any NPR programming on there. Why would that bus ad lie to me? It's not like Winston-Salem needs 2 NPR stations, but still if they can advertise Free Speech News as NPR then this blog is now the official website of the Major League Soccer.