The Crown has two tasks, the first one is a necessity spreading the transmitting antennas e.g. sectoral. Antennas have back radiation which can lead to interference and disruptions. Because the strength of the electromagnetic field decreases with the square of the distance, even a small separation significantly weakens the interaction of the antennas. It is worth checking the specifications of the devices to determine the minimum recommended antenna separation by the manufacturer.
The second task of the separation crown is Torsion stiffening of the mast (after installing an additional set of rigging). Antenna masts have high resistance to vertical forces, medium resistance to lateral forces (thanks to lashings) and relatively low resistance to torsion (classic rigging prevents torsion only slightly). Turning may be a problem in high winds or during service work on the mast. It is particularly uncomfortable for radio line which may come loose due to twisting. The separation crown improves this situation to a significant extent.