How to output an image from a computer with hdmi to a coaxial cable to an old TV?

Question

A television

In general, there are many old TVs. I want to make a wall out of them, to display an image for each (it would be cool different, but not necessary) from a computer (or several) with hdmi. All sorts of adapters from hdmi to tulips are a little expensive, with splitters it’s generally incomprehensible.
I thought it might be possible to somehow make cable television from a computer using an ordinary coaxial wire. It will turn out like your own television with different channels, in fact, the problem with splitters and cost will be solved, and as a source, you can probably use one computer that will send several image streams to different channels. But how to do this is not clear, a 5-minute search on Google did not help.
Help, please, who understands this matter :)

Answer 1

HDMI to AV cost 500-700 rubles, tulip splitters - well, 20 rubles (or just twist the wires)
You probably shouldn’t bother with the antenna