a device for a full - duplex - capable radio transmission system with ds - cdma access , including a central radio base station , and a plurality of subscriber stations which are independent of one another and which are each designed with at least one transmission and reception antenna , the radio base station having a reception antenna divided in its horizontal antenna characteristic into a plurality of reception segments , and an evaluation unit connected to the reception segments and operative to determine which of the reception segments has the best reception quality on a subscriber - specific basis and to select the determined reception segment for further data processing , the radio base station further including a transmission antenna having a segmented antenna characteristic .