I would actually say that you are not thinking scientifically enough. You need to think about how signals travel though the air. The signal from the antennas do not go straight out from the tip, that is a dead zone. If you have two of them, then if the Rx's are getting pounded with Rf interference, the one that is pointing right to the Tx will lose signal because of all of the "noise" around it, but the one that is perpendicular to the Tx will keep signal thus keeping the heli in the air.
You need to be safe with this helicopter. you are swinging 550mm blades that have a force that can easily break skin and bone. The helicopter you are flying has the power to kill someone. Why not take all of the precautions you can? It's about safety in this hobby.
think about a server for a computer (not sure if you know much about them). Each server that is half worth a crap has two cpu's, two psu's, 12+GB RAM all for redundancy. For even more redundancy, they stack multiple servers on top of each other all computing at the same time. If one goes down, the others pick up the slack. The same holds true for satellite Rx's.