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In a three-element Yagi, how do the reflector and director lengths compare with the driven element?

The reflector is longer and the director is shorter.

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  1. The reflector is shorter, and the director is longer
  2. The reflector is longer, and the director is shorter ✔
  3. They are all the same length

Why: On a three-element Yagi the reflector is longer than the driven element, and the director is shorter. The driven element itself is about a half wavelength.

Huh, didn't know that: Increasing boom length and adding directors increases a Yagi's gain.

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References

Answer: The reflector is longer, and the director is shorter. On a three-element Yagi the reflector is longer than the driven element, and the director is shorter. The driven element itself is about a half wavelength.

  1. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf
    How do the lengths of a three-element Yagi reflector and director compare to that of the driven element?
    Checked 2026-10-11.
  2. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf
    A. The reflector is longer, and the director is shorter
    Checked 2026-10-11.
  3. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf
    What is the primary effect of increasing boom length and adding directors to a Yagi antenna? A. Gain increases
    Checked 2026-10-11.

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