Explanation
Overview If an antenna that previously worked well suddenly develops a higher SWR, something in the antenna system has likely changed. The change may be mechanical, electrical, or environmental. Common Causes Loose antenna hardware. Damaged feed line. Water intrusion. Corroded connectors. Broken antenna wire. Nearby objects moved close to the antenna. Storm or wind damage. Failed matching component. Environmental Changes Heavy rain. Snow or ice accumulation. Wet tree branches. Flooded ground. Temporary construction equipment. Troubleshooting Steps Inspect the antenna visually. Check all electrical connections. Inspect outdoor connectors for moisture. Measure the antenna with an analyzer. Compare current measurements with previous records. Applied to Chameleon Products Portable Chameleon antennas should be inspected after each deployment. Permanent installations should be inspected after severe weather or whenever SWR changes unexpectedly. Related Articles Why Is My SWR High? How Often Should You Inspect Your Feed Line? How Do You Waterproof Outdoor RF Connectors? What Is SWR? Related Products All Outdoor Chameleon Antennas
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.
