Discussion
What happens to a dipole's pattern as it is lengthened beyond one wavelength?
Answer: C
Once the current distribution contains regions of opposite phase, their contributions cancel in some directions and add in others, so the broadside lobe splits and multiple lobes appear. The axial nulls remain, since the axial field is zero for any linear current. The pattern therefore becomes more complicated rather than simpler, and this is the reason long wire antennas have such intricate patterns and why the half wave length is a natural choice.
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