I helped a guy a couple of years ago with a camera hung under a helo....he flew the helo and I was "flying" the camera...2 radios 2 receivers....this was a learning experience for both of us....the surprising thing to me was if he banked the helo hard, while I was fixed on a ground target, (I am watching what the camera is seeing on a tv screen)...It was very difficult to find that ground target again.....he had to learn not to yank and bank so hard...I had to learn not to follow the target going into a turn.....
Bottom line is we used to radios and 2 seperate receivers