General exam question G9D05
Subelement G9, ANTENNAS AND FEED LINES· Group G9D
What is an advantage of vertically stacking horizontally polarized Yagi antennas?
- A.It allows quick selection of vertical or horizontal polarization
- B.It allows simultaneous vertical and horizontal polarization
- C.It narrows the main lobe in azimuth
- D.It narrows the main lobe in elevation (correct answer)
WhyAn advantage of vertically stacking horizontally polarized Yagi antennas is that it narrows the main lobe in elevation. Stacking horizontally polarized Yagis vertically, one above the other, combines their fields to concentrate more energy at lower elevation angles, narrowing the antenna's main lobe in the elevation (vertical) plane, answer D. It doesn't provide a quick polarization switch or simultaneous dual polarization (all the stacked antennas share the same horizontal polarization), and stacking vertically narrows the elevation pattern rather than the azimuth pattern, so A, B, and C are wrong.
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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