Maybe, probably, but why would you?
Personally, I would not paint an antenna. It's possible that it wouldn't do any harm, but it's very hard to know what's being used to give paint its color. Often times, a metal like chromium, iron, cobalt, or copper is used for bright, sharp colors and the flakes of metal inside the paint can make an antenna less effective. On the other hand, if synthetic or vegetable pigments are used, they're going to have very little effect on an antenna. As I said, how would you know?
Here's the difference between painting a dish and painting an antenna. When people talk about painting a dish, they're usually talking about painting the reflector, which means it doesn't really matter what color is being used as long as the surface just bounces the signal to the front of the dish. With an antenna, you're talking about the signal having to make it through the paint and there's a very good chance it's not going to.
Rather than painting an antenna, I'd almost always recommend buying a new one, or if the problem is that it has developed an unsightly black patina, you can use a metal polish to remove that. Just keep in mind that it will return and that it's not hurting your reception.