I dont know about anyone else but, my fire 155.295 tone-dc,343/was 192.8... Somewhere in mass is another entity that uses that same freq and pl. Thats why we went dc. To the north in biddeford their bus uses the same freq.Simplex. Different pl.. Now, when I use the tone out for my town-on bct 15x,,,I can hear the other 2 entities, not -just- my fire..I also use a ferret 140 feet above sea level. I hit the attenuator and all set.