Good question.
When I was in high school in the mid-60's I came home and watched Merv's variety show on WNBQ channel 5, Chicago. Arthur Treacher was the announcer. He woulds say "from the Little Theatre in Time Square - Here's MERRRRRRRRRRRRRRRRRRRRRRRRRRRvin"
About 7 or 8 years later I watched the independent UHF tv station in Mishawaka. IN(?) that was owned by a short preacher (name forgotten) who talked about "the 90 and 9." They also talked about how they had a very tall tower.
The station was very well programmed but had NO commercials. I believe I read that they went broke. Unsure about call letters. Was it WHMI?
Google is not helping any.
As I remember, 6-7 was Rocky & Bullwiinkle and another cartoon strip (maybe Huckleberry Hound). 7-8pm was Petticoat Junction and Green Acres. They showed Wait Til Your Father Gets Home on occasion, and Merv was stripped for an hour at 8pm. They also ran PTL (I think twice an evening).
Can anybody else remember this?