Got mine at the base exchange also.
I've only used it once so far and mounted outside of the roof of the car using the suction cup as seen in this photo (the RJT). This way, I could just stick my hand out the sunroof and turn it on since I don't have the one that is controlled by a cell phone. If I could do it over again, I would by the cell phone controlled one. I will be playing with mounting techniques for sure.
Here's the video: