Mutual Aid & Common Frequencies 2015 CoverThe Montana Mutual Aid and Common Frequency Manual includes the standard operating procedures and practical applications for using statewide VHF radio frequencies for mutual aid and common use. Emergency responders from different agencies and jurisdictions use these radio frequencies to communicate during incidents and disasters.

Please Note: Table 15 on page 61 of the printed Mutual Aid and Common Frequencies manual is incorrect. The table in the online version is correct, therefore we suggest printing page 61 from here, and replacing it with Table 15 in any printed copies you may have. We apologize for the error.

Mutual Aid Frequency Resources:

Mutual Aid Frequency Updates:

  • Border Interoperability Channel Modification for Public Safety Communications South of the US-Canadian Border: The VLAW31 (155.4750 MHz) BLUE Channel can now be used as a general purpose mutual aid interoperability channel for cross-agency use with Canadian responders within 16 km (10 mi) of the US-Canadian border in Montana. Agencies eligible to use the frequency have been expanded to local, state, tribal, federal and Canadian law enforcement, EMS and fire responders. This additional authorization is designed to enhance cross-border radio communications.
  • North Dakota Frequency Advisory: A number of North Dakota agencies may have tone control on the receive side of commonly used mutual aid frequencies. Click here to view the Frequency Advisory.
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