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Antenna should have size comparable to the wavelength of the signal

power radiated decreases with increasing frequency

Effective power radiated by a long wavelength base band signal is small

power radiated from a linear antenna is directly proportional to square of antenna length

answer is B.

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Detailed Solution

We know power $α \frac{l^{2}}{λ^{2}}$ (1) is correct
$P \propto \frac{1}{λ^{2}} \propto f^{2}$ (2) is wrong & (3) is correct.
Length of antenna $\geq \frac{λc}{4}$ ; (4) is correct

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