I was given a Motorola PM400 radio and need help with an antenna selection. I am new to radios so be gently. I am using the radio in my home to strictly just listen to local Fire, EMS and Police, basically using it as a scanner. It has all the local Fire, EMS and Police channels already programmed in. I am running it using a A/C to D/C convertor and works great. I have a cheap, half broken antenna on it now and the reception is poor. I was told the Motorola PM400 is a "Trunking Radio" not sure what that means? The channels I listen to are 151.49 to 159.10 . I am looking for a antenna that has a magnet base that I can just sit on the floor inside my home beside the radio. The radio has a antenna connector on the back that is what I think is called a Mini UHF? Can you guys suggest a good antenna with the make and model number so I can order the correct antenna? I really have no clue on what to order and I don't want to order the wrong antenna. Thank you