As network radio moved to TV in the 1950s and 60s, KOY switched to a full service middle of the road format of popular music, news, talk and sports. Then as adult contemporary music listening switched to FM, KOY began playing adult standards. KOY had good ratings but because it played older music, its audience was also considered older than the demographic that most advertisers sought. Station owner AM/FM (now iHeartMedia) purchased the call letters, studio, and sports radio programming of KGME 1360, and moved it to 550 in April 1999. The KOY call letters and adult standards format was shifted to AM 1230, which had a smaller coverage area than AM 550.