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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

What Is a Lightning Arrestor?

Learn what a lightning arrestor is, how it works, and why it is an important part of amateur radio station protection.

Grounding, Bonding & Lightning Protection Lightning Protection Reviewed 2026-07-14
Short Answer: Learn what a lightning arrestor is, how it works, and why it is an important part of amateur radio station protection.

Explanation

Overview A lightning arrestor , also called a lightning protector or surge protector , is a device installed in an RF feed line to help divert high-voltage surges to ground. It is intended to reduce the risk of damage from induced surges and nearby lightning events. Warning: No lightning arrestor can guarantee protection from a direct lightning strike. During thunderstorms or when the station is unattended, the safest practice is to disconnect antennas from radio equipment and follow accepted lightning safety procedures. How It Works Normally passes RF signals with minimal insertion loss. Provides a low-impedance path for high-voltage surges. Must be connected to a properly designed grounding system. Common Technologies Gas discharge tube (GDT). Quarter-wave stub protectors. Hybrid surge protection devices. Installation Recommendations Install near the cable entry point. Use the shortest practical ground connection. Bond to the station grounding system. Inspect periodically for corrosion or damage. Applied to Chameleon Products For permanent Chameleon antenna installations, a properly installed lightning arrestor is recommended as part of a comprehensive grounding and surge protect

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.