I said earlier:
He came, he installed. This was NOT the plumbing school dropout, this was a VERY conscientious guy who did a truly great job and made a few derogatory comments about the previous installation. I did watch and learned a few things!
All the mess of wires is cleaned up, sorted out, connected properly. The power antenna works, the headrest speakers work and everything is GREAT!
Here's the radio, it's not expensive but it works well and has plenty of power* and all the features that I want. I figure the quality is probably equal or better than the stock radio.