Question about mag mount antennas. I have one that I have had for several years but don't use. It's a K-40 and it seems to draw the color out of the paint. It's not from grit being under it, but the paint will get dull it appears if I run it for any length of time. Is this common. That's the main reason I don't put it on top of my pickup. I also have a galaxy 73 from when I use to run over the road that works fine with the K-40 in the pickup. Any suggestions or does the paint just get dull to a point and no harm done to the finish. Thanks.