A quad going at 40 kph would have to have runtime of an hour. Why do you need that much distance, smuggling stuff across the border?
A simple 2 watt 2.4g booster will get you 2000m.....Known to lose signal sometimes though which will cost you a quad at that distance.
The best for very long distance is UHF....not cheap at all.
Well i need to transfer some stuff accross border. But i don't live in usa, so don't worry i won't break any usa laws. Im from Russia.Why do you need so much distance? Seems suspicious to me.