I'm curious to know what exactly happened with Florence and Myrtle Beach SC. And Wilmington NC.
Back in the early 70s all the cable channels were listed on what looked like a business card, if you can believe that. I don't even know if PBS was listed. But none of the three markets had all the networks. Myrtle Beach technically didn't have any of its own TV stations so there was ABC and NBC from Wilmington (TV Guide had the ABC station listed as ABC and NBC, and the NBC station aired CBS afternoon soaps), CBS from Florence (TV Guide said it was CBS and ABC), and ABC, CBS and NBC from Charleston. And WIS (NBC) from Columbia.
Now the Florence ABC and CBS stations are considered to be Myrtle Beach stations and Myrtle Beach has its own NBC, CW and Fox stations.