Discussion
Why does the voltage reach a maximum at the ends of a half wave dipole?
Answer: D
Where a standing wave of current has a node, the standing wave of voltage has an antinode, so the ends carry the highest potential and are the places most likely to arc at high power. The feed point at the centre is the opposite, a current maximum and a voltage minimum. Radiation resistance is not defined per unit length, and insulation responds to the voltage rather than causing it. This is why end insulators must be rated generously in transmitting antennas.
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