Long range

hi i am gustavo from mexico and i am 6 mounth on UAV system, my objetive its create uav with a long range like a 100km or more, actually i use pixhawk flight controller, tbs crossfire 2w, and tbs fpv 2w, rc doesnt have problem but i have the problem on fpv because I need to use in areas not populated and mountainous, i am new on navio2 and i dont know why its better than pixhawk