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Question Pool -- Category T9B

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A.

Four straight, parallel elements in line with each other, each approximately 1/2-electrical wavelength long

B.

Two or more parallel four-sided wire loops, each approximately one-electrical wavelength long

C.

A vertical conductor 1/4-electrical wavelength high, fed at the bottom

D.

A center-fed wire 1/2-electrical wavelength long

See answer.
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