The radiation resistance of a λ /16 wire dipole in free

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The radiation resistance of a λ /16 wire dipole in free space will be nearly—

1. 1 Ω
2. 3 Ω
3. 13 Ω
4. 30 Ω

Correct Option: B

Radiation resistance is given by relation

R_rad = 789.5		dl		²
		λ

= 789.5 ×		λ		²	= 3.08
		16λ

where dl → length of dipole
R_rad = 3.08 Ω