General exam question G9C10
Subelement G9, ANTENNAS AND FEED LINES· Group G9C
Which of the following can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna?
- A.The physical length of the boom
- B.The number of elements on the boom
- C.The spacing of each element along the boom
- D.All these choices are correct (correct answer)
WhyThe physical length of the boom, the number of elements, and the spacing of each element along the boom can all be adjusted to optimize a Yagi antenna's forward gain, front-to-back ratio, or SWR bandwidth. A Yagi's boom length, the number of elements mounted on it, and the spacing between those elements are all parameters an antenna designer adjusts together to trade off forward gain, front-to-back ratio, and SWR bandwidth, so all three answer the question, answer D. Since A, B, and C are each individually a real adjustable design parameter, the complete answer has to include all of them.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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