HealthyDrones.com - Innovative flight data analysis that matters P3S from Romania ....3,6 km with mod 5.3 PapaTita 20db on RC bosted both (2,4 and 5.8 ) + 21 db on bird work maybe on 4 km but i m afraid on 3...4 C (temperature) go more distance because Li-Ion have problem in cold wheater.