Discussion
Which statement about the far field of an antenna is NOT correct?
Answer: C
Correct answer: the Poynting vector there is largely reactive
That describes the *near* field, not the far field. Far from an antenna the vector is almost entirely real, since that is what radiation means. The other three statements are all correct: the field amplitude falls as \( 1/r \), the power density therefore as \( 1/r^2 \), and over a small region the wavefront is flat enough to be treated as a uniform plane wave.
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