The Wisconsin Interoperable System for Communications (WISCOM) is a shared system that first responders in communities across the state will use to communicate during a major disaster or large-scale incident. WISCOM supports up to four simultaneous conversation paths during an incident, dramatically increasing the current capacity available with statewide mutual aid channels and allowing responders from any area of the state to assist another community without losing communication capabilities.

2017 WISCOM Viability Study 

Having mission critical technical problems with WISCOM? Immediately call 608-2WISCOM (608-294-7266) for assistance.

WISCOM is a VHF (Very High Frequency), digital P25 (Project 25) radio network which currently supports over 23,000 radios. As of December 2016,  there are 116 sites on air. The most recent site map may be found here: WISCOM Site Map.

WISCOM was built to a 95/95 mobile coverage standard from the core sites, which means it covers 95% of the state 95% of the time using a 50 watt mobile radio with a quarter wave roof mounted antenna. DOT provided an update on WISCOM at the 10/10/14 SSMG meeting.


  • Leverages existing radio towers and other infrastructure, which lowers initial cost. 
  • Does not use proprietary technology so it will be flexible; it works with the wide variety of local systems currently operating in the state. 
  • Shares a statewide infrastructure that will result in long-term cost-savings for everyone. Communities are already spending millions of dollars on systems that do not allow interoperability. As communities replace their aging local systems, they will be able to leverage the state backbone, sharing infrastructure costs and avoiding costly duplication of equipment. Communities can then build out additional local coverage and capacity to meet their needs when they are ready. 

WISCOM Procedures & Plans

WISCOM Subscriber Units
As of November 2019, the following radios have been certified for operations on WISCOM.

WISCOM Certified Subscriber Units  excl

Guidelines for new radio purchases:
New radios purchased with grant funds must meet the following grant standards. Note that some WISCOM eligible models (listed above) do not meet all of the grant standards requirements:

  • Compliant with current P25 standards Phase 1
  • Equipment must qualify for WISCOM operation through the Subscriber Certification Program
  • Capable of operating on 2 or more digital trunked systems
  • Capable of passing the adopted and current P25 “Enhanced VOCODER Methods of Measurement of Performance” specified in (Telecommunications Industry Standard) TIA-102.BABG
  • P25 digital trunking enabled
  • Provide 512 channel minimum capacity
  • Minimum capability of 128 control channels
  • Capable of Alphanumeric Display
  • VHF Portable Radios have 138-174 MHz band spread
  • VHF Mobile Radios installed with a Wideband antenna (139-169 MHz or better)
  • Programmed according to Statewide Mutual Aid Frequency Plan within the Statewide Communications Interoperability Plan (available for download here) with a minimum of 25 narrow banded statewide mutual aid channels.
  • Programmed with the appropriate WISCOM talk groups

Recommendations for new Radios:
Recommendations for new radio purchases, based on experience and technical experience:

  • Compliant and capable for P25 Phase 2 
  • Ability to program multiple trunked system talk groups and conventional frequencies in the same zone


Want to subscribe to WISCOM? 

Please email  for more information. 

Want to obtain system key and programming information for WISCOM?

Please email  for more information.

Want P25 Radio ID Plan information?                                                                                 

Try here or contact 

Having technical problems with WISCOM? 

Call 608-2WISCOM (608-294-7266).