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G9D05:What is an advantage of vertically stacking horizontally polarized Yagi antennas?

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What is an advantage of vertically stacking horizontally polarized Yagi antennas?

Direct answer summary (2023-2027 NCVEC pool)

The official correct answer for G9D05 is It narrows the main lobe in elevation.

The key fact is It narrows the main lobe in elevation. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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