The present invention aims to provide an antenna tower structure comprising an essentially vertical elongated tower body with an internal installation shaft provided therein. One or more radio base stations are arranged in the installation shaft in the vicinity of one or more associated antennas at the top of the tower body. The installation shaft is formed to allow personnel access to the radio base station. The tower body is comprised of a metal-reinforced concrete material, and the mass ratio between the tower body and the radio base station equipment together with the antenna arrangement exceeds 15:1. The tower body is formed so that the mass center of the tower body and radio base station equipment is lower than ½ of the tower body height.