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Which matching system connects the coax shield to the antenna center and the conductor a fraction of a wavelength to one side?

The gamma match.

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  1. Delta match
  2. Gamma match ✔
  3. T-match

Why: The gamma match runs a rod alongside the driven element. The coax center conductor taps in at a point away from the center. It is common on Yagis.

Huh, didn't know that: A gamma match can shunt feed a grounded tower at its base (E9E09).

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How does an antenna designer solve an impedance matching problem? By taking a moment of reflection.
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References

Answer: Gamma match. The gamma match runs a rod alongside the driven element. The coax center conductor taps in at a point away from the center. It is common on Yagis.

  1. NCVEC 2024-2028 Amateur Extra Question Pool, 4th Errata (Feb 4, 2026) ncvec.org/downloads/2024-2028%20Extra%20Class%20Question%20Pool%20and%20Syllabus%20Public%20Release%20with%204th%20Errata%20Feb%204%202026.pdf
    A. Gamma match
    Checked 2026-10-11.

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