From what I have researched and the information on FliteTest, the most effective way to orientate your 2.4 antenna is with the joint at a "L" shape or bent. Your antenna on the transmitter has a "dead" spot in the middle and If you point the transmitter directly at your receiver "or plane in this case", you could lose signal for a moment. While keeping it bent, your spread will be much more effective.
Thank you. This does confirm the experience I have had in my range test and it makes sense that they would not put the joint in the if it wasn't needed.