Considering your location (from your ham call and checking the associated counties in the RR Database) and the very generic description (normal police and fire frequencies and some P25 systems) of what you want to listen to, I would recommend a good VHF/UHF dual-band ham antenna. It should provide great coverage on the VHF-Hi and UHF frequencies in use by the agencies in your area. Since you have no significant PD or FD use of the 800 MHz frequencies or the VHF-Low band frequencies, you can eliminate those from your antenna choices and be able to get one with a reasonable size and good gain.I am going to be installing my BC536HP in my car and need an antenna. What should I get and why? Looking to monitor the normal police and fire frequencies and some P25 systems.