Interesting that KPLR wasn't carried.
I don't know if you're referring to Columbia or Centerville (Iowa) but that's true in both places.
Centerville had a string of franchise elections in the late 1960s. One proposed franchisee was going to offer KPLR, brought in by microwave relay. But they were going to charge $6 a month for service, and a local group came up with a proposal for a system that was going to charge $5 a month, but that system would not bring in any independent stations. Guess what happened?
The $6 a month system was voted down, the $5 a month system was voted in, and that's what we got.
As for Columbia, there's a long and rancorous history of cable TV controversies. There were two local stations until 1971, with ABC programming fit in on the two stations on a space-available basis, and always in black and white. Over time, local viewers started expressing their unhappiness with the limited choices. And, in the university community, the lack of an NET (later PBS) station was a major complaint. Finally, a cable franchise was approved in 1977, from a new St. Louis company that promised a high-capacity system for the time...22 channels. This spooked the local TV stations, especially the new UHF that had come on the air in 1971 as an ABC affiliate. There were negotiations. The local stations did not want an independent outlet on the system. They were fine with having PBS from Kansas City and St. Louis. But they especially feared KPLR, which had started functioning as a mini-network with carriage on many outstate systems. There was a cross-state CARS band system at the time, piping in St. Louis and Kansas City stations for the Moberly and Jefferson City cable systems. (Don't ask me why those two systems were up and running well before Columbia was...I don't know.) The new Columbia system bought into that relay, which also had KBMA (now KSHB) from Kansas City available. The new system proposed replacing KPLR with KBMA in Columbia, and that was deemed acceptable. I believe St. Louis's KDNL was not on the CARS-band relay at all.
Columbia did get some of the early satellite channels that surrounding communities didn't have the capacity for, and converter boxes were used from the very start. HBO was available, too.
One channel not shown on that card was CBN, which, if I recall correctly, was put on channel 20. Madison Square Garden came a little later and was on 22.