Actually, the Sirius satellites are in highly ellipitical orbits that appear to follow a sort-of figure-eight shape. See:Pawned said:The key for Sirius is how close you live from Minnesota. Their satellite is up above there, so if you live down south, the dash mount may not work as well.
My Sirius antenna is mounted just above the trunk lid, which works fine on my convertible. I'm not sure if it would work as well on a coupe.