The antenna is jet black and I am mounting it outside. I would like to paint over the black part with grey paint so it blends better with the colors in my condo community. Any problem doing this?
As long as you use the proper paint and know how to prep plastic, you should be OK.
Otherwise, it will just flake off and will end up looking even worse than it does now.
Don't use metallic paint.
Just remember, If you paint it, you can't return it.