PURPOSE: To standardize a support and reduce the weight of a system and to decrease the number of components and reduce the cost by supporting a main reflector by the support consisting of a ring part for supporting a horn and plural support column parts and installing a subordinate reflector on the ring part of a support which is formed in the same shape with the support for the main reflector and joined opposite the support.

CONSTITUTION: The subordinate reflector support in the same shape with the support consisting of support column 5 and a center ring 6 for the main reflector, i,e. the support columns 5a and center ring 6a are provided. The both supports are joined together through abutting parts 7 and 7a provided to end parts of both support columns 5 and 5a and the subordinate reflector 3 is installed on the ring 6a. This antenna system allows the supports to be standardized and produced, reduces the weight of the system, and decreases the number of components because the supports for the main reflector 1 and subordinate reflector 3 are simply structured in the same shape.