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

= 10¹ ⟹ P_r = 10 watt.

.

6 dB = 10 log₁₀

⟹ = 10^0.6 ⟹ 3.98

P_r = 3.98 mW.

.

Inside a conductor free charge is zero, hence, ? x D = 0.

Wave impedance

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For uniform plane wave, E and H must be in a plane but perpendicular to each other.

f(x - v_ot) represents in +ve direction while f(x + v_ot) represents a progressive wave in -ve direction.

Put a = 180° in Eqs

Otherwise also a = 180° means no conduction.

Hence zero output voltage.