I think you have a valid concern about the position where this antennae would mount. My guess is that all PC's antennae are mounted relatively close to the front, where the entertainment center is located. I too would be concerned about the lift created by compressed airflow at highway speed, especially in conditions like a gusty headwind.
I checked reviews on Amazon, and while most were favorable as to reception strength, some thought their batwing style was better.
Is PC using this style on their new units?
Hope someone replies to you with actual experience.
Dougn