2/22/2019: From another form, I was given this YouTube video:
https://youtu.be/l4gLrqSonMk. I did ask my questions to the guy on YouTube. His reply was:
"The rubber pole antenna is for sat (XM) only. The AM/FM antenna is integrated into the window. So this shark fin does not affect AM/FM reception. Paint is holding up fine, and same for double sided tape."
He has had his on for over a year. I took the plunge and bought the one he had on his vid. Came in today and color matches dang close to my gun metallic gray. I am going to wait until it gets a little warmer to install it so the 3M tape sticks well. If it's only for Satellite Radio, I only have 1 more year left on my free subscription and wasn't planning on renewing so I should be good.
UPDATE 2/24/2019 with ~20,800 miles in odometer:
Short Term Review.
I installed the fin from
https://youtu.be/l4gLrqSonMk today - 2/24/2019. It got up to 65* today so I followed the YouTube instructions. Very simple installation. Once in the bright sun, the color is very very close to a match but there is a lot of metal flake on the PF and none on the fin. I doubt anyone will notice. Also, this is a big fin. It probably has to because it covers the factory base. I don't think I would like this on a regular car but it doesn't look bad on the top of the PF. Initial reception test for AM/FM and SAT is the same as the rubber antenna. As of right now, I am very satisfied with this mod.