vehicle antenna

Does anyone know what those 2 big pucks are on the top of most of the explorers and some crown victorias? I suspect that they're PCTEL Trooper antennas or Motorola AN000163A01s but I'm unsure. If someone could please let me know, thank you.

Hello, I’m planning on getting an SDS100 soon and we’re coincidentally getting a new SUV and naturally I started thinking about how I could integrate the two (lol) for when I’m in the car. What came to mind was how to improve the scanner’s reception while in the vehicle. Then I thought I...