The tailBeaconX is a great unit, but not a great choice for a 750. It's designed to be installed on the rear of the vertical stab. The problem with a 750 is the rudder goes all the way to the top. You could install it at the top of the rudder by modifying and strengthening the structure a bit. The movement of the rudder shouldn't affect reception much, if at all. The problem is going to be the cable. It will flex every time the rudder moves, so it will become a point of failure. You'd have to do regular inspections, and be prepared to replace it occasionally. For that reason, I'd install a disconnect inside the fuselage near the rudder, and another under a panel on the rudder itself. That way you'd only have to disconnect that section and connect a new one when necessary. You'd also need to be mindful of water intrusion, both in the cable, and in the points where it enters the rudder and fuselage.