To prevent through passive intermodulation, a beam-shaping network from being interfered.

An antenna 1 is radiated a prescribed shaped contour beam 6 and installed on a support base freely movably and turned at a prescribed location corresponding to a specific object section by an electronic control driver 10 which is connected operatively to the antenna. A fixed feeding horn 3 excites the antenna. When the antenna is moved at a 1st position, a 1st radiation pattern in response to a geographical feature of a 1st object section 4 is generated, and when the antenna is moved at a 2nd position, a 2nd radiation pattern in response to a geographical feature of a 2nd object section is generated. A multiple contour beam corresponding to a larger number of object sections is obtained by the further design of the antenna shape.