Explanation
Overview Disconnecting antenna feed lines during thunderstorms is one of the most effective ways to reduce the risk of damage from lightning-induced surges and static electricity. Even when a station includes grounding, bonding, and lightning protection devices, no practical system can guarantee protection from a direct lightning strike. Safety Warning: Never install, adjust, disconnect, or inspect an outdoor antenna during an active thunderstorm. If severe weather is approaching, disconnect antennas before dangerous conditions develop. Why Disconnect? Reduces surge energy reaching equipment. Helps protect radios and accessories. Reduces the likelihood of damage from nearby lightning activity. Provides an additional layer of protection beyond grounding devices. Recommended Practices Disconnect coaxial feed lines before storms arrive. Store disconnected cables away from equipment when practical. Maintain a properly bonded station grounding system. Inspect surge protection devices periodically. Important Reminder No grounding system, surge protector, or lightning arrestor can guarantee complete protection against a direct lightning strike. Personal safety should always take priority
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.
