For all who attempt to answer the basic question, it does not matter where you sum the forces and moments at, as long as you are consistent with that reference point. If you do, you will realize that the height of the tail rotor above or below the main rotor hub has nothing to do with the hover angle. There is a misconception that the aircraft "hangs" by the rotor hub, so all forces are summed there. This is fundamentally in error, and will lead you to determine some bizarre findings.