Brent, give Go Westy products a buzz, http://www.gowesty.com/

 He has several options for you, in several price ranges.

I got the DELUXe cover from him last winter, and it worked great, but make
sure you prop something up inside the roof rack area.  If you don't, snow
(if you have snow where you are) melts in the luggage area, and freezes your
cover to your pop top like a rich kid to daddy's wallet.

As for the antenna question, just lower your antenna, or... the cover I got
came with a small kit to make a specific hole to go around the antenna.

Good Luck!

Steven Shane