When you get the XM radio, is the antenna on top of the car? Is it black?
Can you have it placed inside the car?

If you coupe doesn't come with it, can the dealer install it?

When you get the XM radio, is the antenna on top of the car? Yes and No
Is it black? Yes
Can you have it placed inside the car? Yes

If you coupe doesn't come with it, can the dealer install it? Yes

I think on the 06, the antenna is the color of your car.