PURPOSE:To cover a specific district effectively with plural beams, by providing two reflecting mirrors in which the plane of polarization of reflected elecromagnetic waves is orthogonal with each other and exciting horns to adjacent beams with the orthogonally polarized waves. CONSTITUTION:A reflecting mirror is constituted of reflecting mirrors 1a, 1b reflecting electromagnetic waves whose plane of polarization is orthogonal with each other, the horns 2a, 2c are excited by using the reflecting mirror 1a and the horns 2b, 2d are exited by using the reflecting mirror 1b. A primary radiator 3a consists of the horns 2a, 2c and a primary radiator 3b comprises the horns 2b, 2d and the primary radiators 3a, 3b are used with orthogonally polarized waves each other. The beams 4a'-4d' are the beams irradiated from the horns 2a-2d respectively.