Hi, looking at a Phantom, and the following initial setup. I'm not planning to do "actual" goggle FPV, but would like to see a live feed. GoPro video cable - will probably cut an extra hole in my skeleton backdoor Rx/Tx - do I need an extra antenna at either end if I'm staying within LOS and standard tx range? Can I run this off the aux power output, or should I run a separate battery? At 150mA draw, it barely seems worthwhile to add another battery?