I am getting closer to getting new radio for monitoring RISCON. I dont understand if I am programming a CENTRAL MAIN FREQUENCY or the individual towns that use RISCON. I live in Cranston. Would I be able to hear as far down as Westerly? Or just the area of the state I am in? Do I need a dedicated antenna to a certain frequency? Are most of the RISCON frequencies that the towns are on, UHF?