Numerical - Antenna height for transmission of signal

The minimum antenna height required for transmission in reference to wavelength λ is

a.) λ
b.) λ/4
c.) λ/2
d.) 4 λ

Correct Answer : b.) λ/4

Explanation:

For effective transmission of signal by the transmitter, the antenna height should be at least quarter length of the signal wavelength i.e., λ/4

L= λ/4
= c/4f

Required antenna height decreases with increase in frequency of the signal so modulation is done. With modulation, the low frequency signals are shifted to high frequency signals.