range

Hey all I have been researching antennas for prospective scanner I am looking to buy, ideally I want a handheld for my car and rig a magnetic mount antenna on the trunk, though is it worth it? What is the range of handheld antennas?

Just wanted to let everyone know that may live close to Camp Atterbury in Edinburgh, IN that range control is a very active frequency. 138.0375 broadcasting in the clear. Radio checks required every hour at the bottom of every hour. Heard them talking about "UAV" today and about being careful...