The Pi has a 5TB hard drive attached with perhaps 1000 videos or so. The app has a schedule and plays the videos according to the schedule. It starts up in the morning, plays tele-courses, moves on to old TV shows, an afternoon movie, after school shows begin around 3:00 PM, a comedy show around dinner time, an evening movie, some late-night content, then the Indian head and "We Will Resume Broadcasting Tomorrow Morning...."
It fills dead airtime by choosing randomly among (literally) thousands of YouTube short clips I have on the drive — or showing a title card indicating when the next show begins.
Partly it's a fantasy — to have my own "channel" with my own scheduled content — my fantasy station.
Partly it serves to put on content I would otherwise not be inclined to pull up, double click and watch. It adds the serendipitous element to TV watching that I miss before streaming. The movie "Charly" (1968) just came on last night and I am sure I have not seen it since I was a teenager — had to stop what I was doing and watch a few scenes I recall vividly.
Today's lineup here: https://engineersneedart.com/UHF/
(Since the schedule is in JSON format, it was easy enough to make a web front end to display today's schedule.)