XM antenna wire cover

Trying to figure out what to cover the wire running from the top of my front windshield to the magnetic XM antenna on my roof. Anyone have a good idea? I've checked a couple of auto parts stores, but they didn't have anything. I assume it would be something that would cover the wire and stick to the roof.

Thanks!

run it from the back to the front. Run it under the plastic housing the 3rd brake light. Won't see any wires