Embodiments relate to a transmit device, the transmit device comprising: at least one logical antenna port configured to provide a broadcast component signal; an antenna array having M number of rows and N number of columns of antenna elements; and a processor configured to select Q number of columns among the N number of columns, where Q≦N, determine a phase centre location (PCL) for the logical antenna port, wherein the phase centre location is arranged in a point on a vertical axis (A) located in the Q number of columns, map the logical antenna port on the physical antenna ports of the Q number of columns.