Pour une antenne Yagi à trois éléments, quel espacement approximatif des éléments (en longueurs d'onde) offre le meilleur compromis entre gain et rapport avant/arrière?

Why

A spacing of 0.20 wavelengths strikes the right balance for a three-element Yagi, placing the reflector and directors close enough to interact strongly for good gain while keeping the rear signal low. The full explanation — and one for every question — is in Pro.

Practise this section

Feedlines and antenna systems is section B-006 of the Basic exam: Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.

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