Discussion
What is the directivity of a full wave dipole compared with a half wave one?
Answer: B
Lengthening to a full wavelength narrows the broadside lobe and raises the directivity to about 2.4, though the impedance becomes awkward. Beyond about 1.25 wavelengths the main lobe begins to split and the broadside directivity falls again. Cancellation is complete only in particular directions rather than everywhere. The general lesson is that longer is better only up to the point where the current distribution develops regions of opposing phase.
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