I remember when TV Bland first started broadcasting, they would run entire episodes of everything as was mentioned. Their pride and joy was to show the entire I Love Lucy with bumpers, and the original little animated figures, instead of the familiar "heart" opening and closings used for...
Sci-Fi - Boy they used to show a lot of stuff, Voyage to the Bottom of the Sea, The Time Tunnel, Twilight Zone, The Outer Limits, Science Fiction Theater
During those years, I absolutely loved MonsterVision, Joe Bob Briggs Drive In Theater, Up All Night, Night Flight, and many, many other shows...
TNT - The Travels of Jamie McPheeters, Then Came Bronson are two that immediately come to mind, plus many more that I can't remember at the moment.
F/X - Casey Jones
CBN - I think they showed The Real McCoys, and I know they showed The Farmer's Daughter and The Patty Duke Show