E9D02:How can two linearly polarized Yagi antennas be used to produce circular polarization?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E9D02 is Arrange two Yagis on the same axis and perpendicular to each other with the driven elements at the same point on the boom and fed 90 degrees out of phase.

Use this action or method: Arrange two Yagis on the same axis and perpendicular to each other with the driven elements at the same point on the boom and fed 90 degrees out of phase. It is the choice that directly completes the job described in the question.