Question #910Antennas and Radio Wave Propagation

A half-wave dipole fed at the centre has a radiation resistance of approximately

  1. 50 ohms always
  2. 73 ohms in free space ✓ Correct answer
  3. 300 ohms
  4. 600 ohms
Explanation: Centre-fed dipole ≈ 73 Ω free space.