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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

What Is an NMO Mount?

Learn what an NMO mount is, how it works, and why it is one of the most common vehicle antenna mounting systems.

Getting Started HF Fundamentals Reviewed 2026-07-14
Short Answer: Learn what an NMO mount is, how it works, and why it is one of the most common vehicle antenna mounting systems.

Explanation

Overview NMO (New Motorola Mount) is one of the most widely used antenna mounting standards for mobile radio installations. It provides a secure mechanical connection and reliable RF performance for vehicle-mounted antennas. Advantages Excellent electrical connection. Weather-resistant design. Low-profile installation. Wide industry support. Easy antenna replacement. Typical Applications Public safety vehicles. Commercial fleets. Amateur radio mobile stations. Government communications. Utility vehicles. Installation Considerations Proper grounding of the vehicle body. Correct hole size. Quality coaxial cable routing. Effective weather sealing. Applied to Chameleon Products While most Chameleon HF mobile antennas use the industry-standard 3/8-24 mounting interface, operators frequently encounter NMO mounts when installing VHF/UHF antennas alongside Chameleon HF systems on the same vehicle. Related Articles What Is a 3/8-24 Antenna Mount? What Is a Mobile HF Antenna? What Is Coaxial Cable? How Do You Weatherproof RF Connectors? Related Products CHA MARINE-A CHA MAS-T-A

The exact result depends on the complete station: frequency, geometry, feed line, matching network, return-current path, environment, operating power, and the reference plane of any measurement. A low SWR establishes an impedance relationship at that point; it does not by itself prove efficiency, radiation pattern, compatibility, or safety.

What to Verify

  • Use the newest official product guide or primary service documentation.
  • Confirm the exact model, revision, components, configuration, and operating conditions.
  • Begin tests at low power and change one variable at a time.
  • Do not infer compatibility from connector or thread fit.

Learn Next

  • Antenna Selection: A Mission-First Decision Guide
  • Engineering Design Tradeoffs in Portable HF Antennas
  • Antenna Measurement Reference Planes
  • Understanding Common-Mode Current

Source note: Independently synthesized with reference to The ARRL Handbook for Radio Communications, 99th edition (2022), and The ARRL Antenna Book for Radio Communications, 24th edition (2019). Verify changing regulations, services, software, specifications, availability, and safety requirements against current primary sources.