Quel type de ligne de transmission comporte deux conducteurs maintenus à une distance uniforme l'un de l'autre au moyen d'entretoises isolantes ("spreaders")?

Why

Open-wire line fits the description because it uses two separate wires held a fixed distance apart by insulating spacers, often called spreaders, which keep them from touching while allowing air to act as the main insulator. 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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