The figure depicts a half-wave dipole connected to a generator

The figure depicts a half-wave dipole connected to a generator

The figure depicts a half-wave dipole connected to a generator through a matched transmission line. The directivity of the dipole can be modified by placing a reflecting rod a distance d behind the dipole. What would its reflectivity in the forward direction be if:
(a) d = ?????4,
(b) d = ????2.

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