What is an advantage of vertically stacking horizontally polarized Yagi antennas?
It allows quick selection of vertical or horizontal polarization
It allows simultaneous vertical and horizontal polarization
It narrows the main lobe in azimuth
It narrows the main lobe in elevation✓Correct answer
Explanation
An array narrows its beam in the plane containing the stacking axis, so antennas spaced vertically compress the pattern in elevation while leaving azimuth beamwidth essentially unchanged. Stacking horizontally polarized Yagis does not create vertical polarization.