I have painted all my base antennas with Plasti-Dip spray paint, since it is rubber-based. I have painted them with the camo collection to blend into the trees. No negative affects at all on my GMRS repeater antenna, my DMR ham repeater antenna, my ham dual band antenna, or my scanner discone antenna. The SWRs remain low on these antennas, and there is no degradation in performance, so I would imagine the same results would be achieved on a mobile antenna. Just don’t use a metallic-based paint like some of the Krylon/Rustoleum products. I always buy black antennas for my mobiles, because I have no chrome on my lifted Xterra. In fact, I have parts of my Xterra painted with Plasti-Dip spray paint, and it shows no signs of wear after 2 years.