Reduction of reradiated field in equatorial plane of parasitic antenna

A suitable impedance connected at the center of a parasitic dipole or the base of a monopole antenna can reduce to zero the reradiated field in the equatorial plane. The two-term theory provides a simple formula for the determination of the required impedance for dipole elements up to 1.25 wavelengths long or monopoles up to
0.625\lambda
. Examples and tables are given.