Which size of the antenna should have comparable to the wavelength ...

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Which size of the antenna should have comparable to the wavelength \( \lambda \) of the signal, to radiate signals with high frequency?
(a) Atleast \( \sim \lambda / 2 \)
(b) Atleast \( \sim \lambda / 4 \)
(c) At maximum \( \sim \lambda / 2 \)
(d) At maximum \( \sim \lambda / 4 \)
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