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G9C09

In free space, how does the gain of two three-element, horizontally polarized Yagi antennas spaced vertically 1/2 wavelength apart typically compare to the gain of a single three-element Yagi?

SelectAnswer
AApproximately 1.5 dB higher
BApproximately 9 dB higher
CApproximately 6 dB higher
DApproximately 3 dB higher