I'v has my P4 since tuesday, but everytime i try to fly farther away than 1km (aprox. 3000ft), in clear sight, i lose the signal. Yes I'v tried placing the antennas in every possible possition, I'v tried flying it at any hight between 20m and 500m, I also thought I could try to customize the radio-channel, but it won't allow me to do that.. So to make it a bit easier to understand.. Does anyone else get this problem, and do you know how to fix it? And does anyone know why I can't customize the radio channel?