Missiles uplink has separate phased array antennas mounted on a mast but I guess he is talking about the monopulse tracking beams from the radar itself.Why guidance beams? The missiles dont have passive seekers.
A radars range can depend on the current situation and I don't think the 150km range given is for 10 different beams. With electronic beamforming you can make a single very powerfull beam with more lower power beams. It mostly depends on the current target situation.