One antenna which will respond simultaneously to vertically-and horizontally-polarized signals is the:

Why

A helical-beam antenna uses a spiral wire shape that naturally accepts signals regardless of whether they arrive with vertical or horizontal polarization. The full explanation — and one for every question — is in Pro.

Practise this section

Feedlines and matching is section A-007 of the Advanced exam: Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.

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