Features of the electromagnetic (EM) field of a horizontal electric dipole used as the controlled source in the radiomagnetotelluric sounding method taking into account displacement currents in the air and earth are considered. Using calculation results the boundary between the quasi-static and wave zones is allocated. The following features of the wave zone in comparison with the quasi-static one are noted: slower EM field attenuation with distance, changes of the favorable area position for the controlled source radiomagnetotelluric method survey, changes of the directional diagram with the maximum of radiation in the axial area, appearance of the polarization ellipticity of EM field components and delaying of ellipses big semi-axes relatively to the linear polarization for the quasi-static case. Described features of the EM fi ld in the wave zone of the horizontal electric dipole were confirmed by field experiments.