Diffraction of the field radiated by an electric dipole at the edge of a perfectly conducting half plane is considered. The uniform representation of the field in the far zone is applied to analyze the polarization of the field depending on the orientation and position of the dipole relative to the edge. The analysis is performed in the entire observation space. It is shown that the linearly polarized radiation of the dipole with the axis perpendicular to the edge of the half plane is transformed into the elliptically polarized radiation.