I'm assuming that your in Georgia, given that you posted in this sub-forum. A reference list that I have indicates that both Hall County and Gainesville municipal at one time or another used 155.160 as an emergency freq. Being that Hall is P25 now, it's not very likely that it's still in use there. Dot 175 also seems to have been in use by Hall in the past. That's about all that I can find, FWIW.