I have read about the differences between the different models of controls, video compression being moved to the iPad etc. but mostly confused about the transmitter power out and range. The B having 1.2 KM range and the C having 3KM range. I have a B model and get approx. 2 Mile range before RTH. What are your experiences when putting a ITELITE or FPVLR antenna on the B model? Can you get 4-5 miles non boosted with this set up.