I would search 162-174 Mhz
Concentrating on 169.5125-173.2000 Base/repeater output
and
173.4000-173.9875 Base/repeater output
Federal VHF/UHF Channel Plans - The RadioReference Wiki
162-174 MHz
NTIA Manual Chapter 4 Section 4.3.7
Government land mobile channels are normally on 12.5 kHz steps (162.05, 162.0625, 162.075 ...) in NFM, P25, or other digital voice modes.
No standard offset.
There are other unpaired single frequencies in other parts of the band that are not specified in the manual.
Use of the band 162-174 MHz by the military agencies is limited to non-tactical or intra-base radio operations.
162.0500-166.4875 Mobile/repeater input
166.5000-169.5000 Unpaired single frequency systems
169.5125-173.2000 Base/repeater output
173.2100-173.3900 (Note: This is a non-federal band)
173.4000-173.9875 Base/repeater output
They have recently changed frequencies. Does anyone have the new ones?