Can the system be moved or permanently removed?
Yes... base units (the part attached to the vehicle) are tape mounted and can be removed. It is best to do this when they are warm. Park in the sun or lightly preheat them with a hairdryer. When the bases are warm, peel them off by starting at a corner. If you must use a tool to start peeling an edged, use a smooth edged tool and be careful not to scratch the vehicle. Replacement bases are available for remounting or repositioning and are listed in the Parts and Accessories link of the particular model page. The tape is applied here at the factory using a special tape enhancer and is sold only as a taped base set.
How large is the base unit?
The outside diameter of large base units is 60 mm.