Radio Amateur Quiz Canadian License

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Question B-006-010-006

What is an advantage of downward sloping radials on a ground plane antenna?

Correct Answer

It brings the feed point impedance closer to 50 ohms

Explanation

A standard 1/4-wave ground plane with horizontal radials has an impedance around 35 ohms. Sloping the radials downward raises the feedpoint impedance, providing a better match to 50-ohm coaxial cable.

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