From The RadioReference Wiki

  • This article details the hierarchical structure of the Wiki's categories-tree.
  • Categories that have multiple parents will appear below in multiple branches of the categories-tree.
  • This page is updated manually, and is not programmatically-driven by the master-list of categories.
  • The first part of this article represents the existing categories tree-structure and should not be changed unless the actual tree-structure changes.
  • Please edit only the bottom section ("Proposed Category Stucture Changes") if demonstrating an idea for a proposed change.

  • The article Categories-Tree Notes lists ideas for future category-tree maintenance ideas, and pertinent notes for each idea, so that they do not get "lost" in the growing discussion in the forums.
  • Discussions are in the Wiki forum, and include the following thread(s):

Existing Categories

Sorted Alphabetically

(Later, this list might be placed into a "sortable" table.)

Existing Tree Structure

Orphaned (Uncategorized) Categories

Top Node: Collaboration

Second Node: Aircraft Monitoring
Second Node: Businesses
Second Node: Education
Second Node: Medical
Second Node: Milcom
Second Node: Motor Freight
Second Node: Railroads
Second Node: Satellites
Second Node: Special Events
Second Node: Sports Events and Organizations
Second Node: Transportation
Second Node: Travel Scanning
Second Node: US Federal Government
Second Node: Utilities

Top Node: Wiki Frequencies

Proposed Categories-Tree Structure Changes


  • Aviation (new super category to include the following)
    • Aircraft Monitoring
    • Air National Guard
    • Air Shows
    • Air Show Frequencies
    • Air Traffic Cntrol
    • Air Traffic Control Frequencies
    • Airports
    • Milcom
    • Milcom Frequencies

Amateur Radio Frequencies

  • Amateur Radio Frequencies
    • Amateur Radio Repeaters


  • Business
    • Attractions
    • Business Frequencies
    • CSX Transportion
    • Casinos
    • Fast Food Frequencies
    • Media
    • Motor Freight
    • Railroads
    • Sports Events and Organizations Frequencies
    • Transportation
    • Utilities


  • Milcom
    • Air National Guard Frequencies
    • Air Shows (Air Show Frequencies?)
    • Air Traffic Control Frequencies
    • Aircraft Monitoring
    • Airports
    • Army National Guard Frequencies
    • Milcom Frequencies
    • Milsat
    • US Civil Air Patrol Frequencies
    • US Defense
    • United States Air Force Frequencies
    • United States Army Frequencies
    • United States Coast Guard Frequencies
    • United States Navy Frequencies

Miscellaneous Categories

  • Miscellaneous (dummy tag only)
    • Attractions
    • Business Frequencies
    • Casinos
    • Conservation
    • Education
    • Fast Food Frequencies
    • Media
    • Medical
    • Recreation
    • Satellites
    • Sports Events and Organizations Frequencies

Scanner Information

  • Scanner Data (dummy tag)
    • FTOs
    • Regional Programming
    • RID/UID Lists
    • Statewide Public Safety Systems
    • Travel Scanning
    • Trunked Radio Systems
    • Trunking Information

Special Events

  • Special Events
    • Air Shows (Air Show Frequencies)
    • Major Events and Disasters
    • Sports Events and Organizations Frequencies


  • Transportation
    • Airports
    • Business Frequencies
    • CSX Transportation
    • Motor Freight
    • Travel Scanning

US Federal Government

  • US Federal Government
    • US and Canadian Common Frequencies
    • US Federal Government Frequencies
    • US Federal Prisons Frequencies
    • US Fish and Wildlife
    • US Forest Service Frequencies
    • US Indian Affairs
    • US Land Management
    • US National Parks Frequencies
    • US Reclamation (rename to US Bureau of Reclamation for clarity)

US Regions

  • US Regions (dummy)
    • Great Plains
    • Intermountain
    • Mid Atlantic
    • Midwest
    • New England
    • Pacific
    • Southern