Discussion
What is the fundamental condition for electromagnetic radiation from a conductor?
Answer: A
Radiation requires time varying current, which is to say accelerated charge: a straight wire carrying charge at constant velocity radiates nothing, and a steady direct current produces only static fields. Acceleration occurs wherever the current changes with time, and also at a bend, a discontinuity or an open end, which is why those points on a structure radiate most strongly. Length matters for efficiency and for pattern but is not the fundamental condition, and no antenna needs to be a wavelength in every direction.
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