Discussion
Two dipoles are spaced half a wavelength apart and fed in phase. What is the pattern?
Answer: C
Equal phase means the contributions add broadside, where the path lengths are equal, and cancel along the array axis, where the half wavelength spacing gives a hundred and eighty degree path difference. This is the broadside array. Feeding the same pair in antiphase reverses the situation and gives an end fire pattern. No linear current distribution radiates along a dipole axis, so the last option is impossible in any case.
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