just the stock transmitter set up to take interchangeable antennas gives some serious range boost. With a 6 dbi ommidirectional I can get about .9 miles = 1,448 meters and all together for the pit tail connector and antenna was under $10
and if I use a cheap 4x4 inch 12dbi directional panel antenna I have gone 1.3 miles and never lost signal and could of gotten farther if i hadn't forgot to set the max radius in the naza assistant to be higher then the default setting of 2000m But some one else with the same set up and a duel battery had gotten 1.7 miles. Tho its about the max range one can go out to and be able to make it back safely with enough battery to get back to the home point with an FC40