Discussion
Why does a dipole longer than about 1.25 wavelengths show a split main lobe?
Answer: C
The standing wave reverses direction every half wavelength along the wire, so once the antenna is long enough, oppositely directed currents cancel in the broadside direction and the energy appears in lobes to either side. Radiation resistance never goes negative for an isolated element, feed position affects impedance rather than pattern, and a travelling wave requires a terminated rather than an open wire. The same reasoning predicts the many lobed patterns of long wire antennas.
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