I got my C64!
And my TV!
And the power supply for the C64!
But one of these things (or possibly more than one of them) is not working, and I have no way to figure out which, because I only have one thing with RF out, and only one thing with BNC/coax/RF in, and one power supply for the commodore.
So, tomorrow I’ll hit up some thrift stores and buy some extra gizmos for testing (assuming local thrift stores have anything I can use for testing.)