How big is the Motorola device that goes on the roof?

Specifications regarding the equipment installed on the roof can be found here.

Quick Specs:

• Wind Survival 118 miles/hr (190 km/hr)
• Wind Loading 26 lbs. (11.9 kg) at 118miles/hr (190km/hr)
• Weight 7.9 x 7.9 x 3.2 inches (~200 x 200 x 80mm)
• Weight 3.1 lbs. (1.4 kg)