This 5-column, 3/4-page ad ran on July 21, 1968, in the Kingsport Times-News. I found it when I was going through an old scrapbook. Look! Not a syndicated show in sight; although, the stations did run some NBC and religious programming on the weekends.
I always liked the NBC logo. The microphone is a stylized RCA 44-BX (bi-directional). The WKPT-AM studios used these, since the installation of the equipment after the fire* was supervised by NBC.
*The WKPT studios burned on September 7, 1948, according to the Kingsport Times-News (I misread that date. It was 1946. When I enlarged the page, I saw that it was a “6”, not an “8”, but it was a kind of skeevy 6, at that). The new studio, with all new equipment, opened in ’48.