1979: "ON-TV" debuts on WXON TV 20 Detroit, available to subscribers only begins running evenings starting at 8:00 p.m. For a monthly subscription fee, a descrambler box was provided access to live sporting events, movies, and concerts. Piracy of ON-TV was prevalent with knock-off boxes being sold for much less than the $22.50 monthly subscription fee.
I now seem to remember that an ex-Tiger might have been one of their Tigers game announcers...maybe Jim Northrup as a CC, but not very sure of that.
Forgot to post the link:
http://www.michiguide.com/tv-history/
Odd that it doesn't list "IT" TV, which began ~the same time and was similar to ON TV, but IIRC it only offered movies, including adult X (softcore) but not hardcore XXX titles.
In the 60s and 70s TV sets did not all come with a UHF receiver built-in, although some/many more may have by the 70s. So like over the air broadcast DTV now, if you still own an analog or cathode-ray tube TV set or sets, a set-top box had to be purchased.
Our first family color TV was purchased in the fall of 1967, which was a "Magnavox" floor model. The old B&W family TV was given to my long-widowed paternal grandmother, who had been offered by my father to buy her a color TV as well, but she refused. When she passed in '72, the TV was returned to us and placed in my bedroom. So I bought a UHF set-top receiver for it. Our Magnavox was a very good color TV for its time, and didn't require much futzing around with the color/tint knobs, to be rid of the typical green flesh color issue that was wont to happen when changing the channel dial on color TVs back then.