sentences:  On September 2, 1960, Cox Broadcasting Company, then-owners of WSOC, traded frequencies with WIST at 930 kHz Under the ownership of Cosmos Broadcasting and later Henderson Belk the station gained the WIST legacy of the first true Top 40 station in Charlotte, and by the end of the decade had pioneered the Progressive rock format in Charlotte as "The Amazing AM", but changes were in the works.In 1972, the Progressive Rock format was shifted to WIST-FM at 95.1 MHz, and their calls were changed to WRNA.Belk then sold WIST(AM) to Statesville Broadcasting Company, which gained CBS Radio Network affiliation for the station and began Charlotte's first talk radio format on WIST.