OK I looked through these threads and searched on a couple of different things, can't find anything on this topic (sorry if I missed!).

When I hit about 80 on the interstate, I get a noise that can best be described as a humming/buzzing/whining wind noise that is coming from the rear of the car. I originally thought it was coming from the wheels and the way the wind was hitting the spokes on the (stock) wheels, but rear passengers are saying it sounds like it's coming from the XM antenna on top of the roof - like the wind is hitting it and making a loud humming wind noise once I hit a certain speed.

This only happens when getting up to about 80, and is HORRIBLE on long interstate trips - it's actually really loud and driving me nuts! Anyone else have any experiences with this, know of a fix, or seen a thread that addresses?

Thanks.