HDMI/Composite to coax convertor if that TV was recent enough to be "cable ready", otherwise you'll then need a coax uhf/vhf/fm adapter in the chain.
IIRC, back in the day, there were even composite-to-vhf adapters, but I can't seem to find any currently sold so either my memory is lying to me or they're no longer produced.
Yes, I had a TV in the 80s that had vhf/uhf tuning dials and coax as well since it was "cable ready". It was also oddly setup with the coax input directly below the uhf/vhf standoffs. So anything you connected to it got in the way of interacting with the coax in. And if the coax you used had a wide nut for threading on it could wind up touching the prongs on the uhf/vhf inputs feet causing fun interference.
Prongs? I had to look that up since I hadn't heard of a VHF/UHF connection with prongs before. That doesn't seem very friendly compared to just using a regular plug? In Australia we used these connectors: https://en.wikipedia.org/wiki/Belling-Lee_connector which have existed since the 1920s.
Wow, interesting. I don't think we had those in Australia. I was born in the very early 90s but my mum had a TV from the 1960s and it had a regular plug (like the one I linked to) for the antenna. Those prongs don't seem user-friendly :)
Yeah, composite & RCA are synonymous with eachother. IIRC it's the difference between the connector name & cable name similar to rj-4 connector l/port vs cat-# cables.