The present invention relates to a device, antenna arrangement and method for feeding an antenna array, having a set of wide-beam antenna elements, comprising N input terminals for connection of N individual base-stations and M output terminals for connection to said antenna elements. The device being arranged to feed said wide-beam antenna elements so as to form N narrow-beam antenna lobes and being further arranged to establish a communication channel between the i:th base-station and the i:th antenna lobe so that signals from said i:th base-station is transmitted only in said i:th lobe and signals received from said i:th antenna lobe is only received by said i:th base-station.