A medium wave radio transmitter operating at a wavelength

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A medium wave radio transmitter operating at a wavelength of 492 m has a lower antenna height 124 m. What is the radiation resistance of the antenna?

1. 25 Ω
2. 36.5 Ω
3. 50 Ω
4. 73 Ω

Correct Option: A

Radiation resistance for monopole radiator is given by relation

R_r = 400		1		²
		λ

⇒ 400		124		²	= 25Ω
		492