An antenna, comprising: an antenna unit configured to receive an electromagnetic wave; a column configured to support the antenna unit; an elevation-depression-direction drive transmission shaft configured to transmit a driving force that changes an elevation-depression angle of the antenna unit to the antenna unit; a circumferential-direction drive transmission shaft configured to transmit a driving force that changes a rotational angle of the antenna unit in a circumferential direction thereof to the antenna unit; and a support part configured to support the column, wherein: the elevation-depression-direction drive transmission shaft, the circumferential-direction drive transmission shaft, and the column are disposed at least on an upper side of the support part, one of the elevation-depression-direction drive transmission shaft and the circumferential-direction drive transmission shaft is expandable and contractible, and the antenna further comprises: an elevation-depression-direction drive part configured to generate the driving force that changes the elevation-depression angle of the antenna unit; a circumferential-direction drive part configured to generate the driving force that changes the rotational angle of the antenna unit in the circumferential direction, characterized in that the elevation-depression-direction drive part and the circumferential-direction drive part are disposed below the support part. an antenna unit configured to receive an electromagnetic wave; a column configured to support the antenna unit; an elevation-depression-direction drive transmission shaft configured to transmit a driving force that changes an elevation-depression angle of the antenna unit to the antenna unit; a circumferential-direction drive transmission shaft configured to transmit a driving force that changes a rotational angle of the antenna unit in a circumferential direction thereof to the antenna unit; and a support part configured to support the column, wherein: the elevation-depression-direction drive transmission shaft, the circumferential-direction drive transmission shaft, and the column are disposed at least on an upper side of the support part, one of the elevation-depression-direction drive transmission shaft and the circumferential-direction drive transmission shaft is expandable and contractible, and the antenna further comprises: an elevation-depression-direction drive part configured to generate the driving force that changes the elevation-depression angle of the antenna unit; a circumferential-direction drive part configured to generate the driving force that changes the rotational angle of the antenna unit in the circumferential direction, characterized in that the elevation-depression-direction drive part and the circumferential-direction drive part are disposed below the support part. the elevation-depression-direction drive transmission shaft, the circumferential-direction drive transmission shaft, and the column are disposed at least on an upper side of the support part, one of the elevation-depression-direction drive transmission shaft and the circumferential-direction drive transmission shaft is expandable and contractible, and the antenna further comprises: an elevation-depression-direction drive part configured to generate the driving force that changes the elevation-depression angle of the antenna unit; a circumferential-direction drive part configured to generate the driving force that changes the rotational angle of the antenna unit in the circumferential direction, characterized in that the elevation-depression-direction drive part and the circumferential-direction drive part are disposed below the support part. an elevation-depression-direction drive part configured to generate the driving force that changes the elevation-depression angle of the antenna unit; a circumferential-direction drive part configured to generate the driving force that changes the rotational angle of the antenna unit in the circumferential direction, characterized in that the elevation-depression-direction drive part and the circumferential-direction drive part are disposed below the support part.