I bought a used, crashed, phantom 3 adv. Ive solved most of its damage now (gimbal yaw arm was bent among other things, managed to straighten it without breaking by using blow torch, while I wait new parts), but I only just noticed one antenna is cut and the PCB part missing. Its the one on the front right leg. Ive ordered some new ones, but Im curious; are the 4 antenna's doing the same thing, but entirely for redundancy (/diversity), or are there like 2 antenna's for control and 2 for video ? Does anyone have an idea which antenna does what? Also, Ive not taken off the shell yet, but I think I'll have to, in order to replace the antenna. Ive seached, but not found a video showing how to replace them on a phantom 3 adv. I'll probably figure it out, but it would be nice if I could watch it while I wait for the spares to arrive.