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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

Why Place an Antenna Tuner at the Feed Point?

Learn why placing an automatic antenna tuner at the antenna feed point provides better HF performance than using a tuner inside the radio shack.

Getting Started HF Fundamentals Reviewed 2026-07-14
Short Answer: Learn why placing an automatic antenna tuner at the antenna feed point provides better HF performance than using a tuner inside the radio shack.

Explanation

Overview For many non-resonant antennas, placing the tuner directly at the antenna feed point provides significantly better performance than installing the tuner next to the radio. The Problem with Shack Tuners If a tuner is installed inside the operating position, the coaxial feed line between the tuner and antenna may carry high SWR. High SWR on the feed line can increase RF losses, particularly on higher HF frequencies and with longer coaxial cables. Benefits of Feed-Point Tuning Lower feed-line loss. Higher overall efficiency. Improved transmitted power. Better received signal levels. More reliable multiband operation. Best Applications Long-wire antennas. End-fed antennas. Broadband antennas. Vertical antennas. Remote antenna installations. Applied to Chameleon Products The CHA URT1 and are specifically designed for feed-point installation. By matching the antenna before RF enters the coaxial cable, they help reduce transmission-line losses and maximize overall station efficiency. Related Articles What Is a Remote Automatic Antenna Tuner? What Is SWR? What Is Feed-Line Loss? What Is a Non-Resonant Antenna? Related Products CHA URT1

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.