Originally Posted by AeroWRX
Right now we are using a 2.4Ghz radio to fly the plane. How far can we safetly fly using the 2.4ghz frequency? Should we move to something lower for a 1 mile to 2 mile radius? What about a 20 mile radius? I would imagine something like Dragon Link for the latter.
Look into 433mHz based HAM band systems as you want to venture past a mile with no concern. Study the variations on each and accept it will take some time to study them all, but once you understand how they work, the various options you'll be glad you spent the time. You'll need to get your HAM Technician's License which is easy to get and a good thing to have. There is great study info on RCG posted by BloomingtonFPV.
As for the 20 mile thing.... don't ask... way past what you need to be thinking about. Is it possible, sure.... but only few have been on a trip out that far and it takes tons of experience and knowledge for long range stuff like that. It's best to start small inside of 1 mile and work your way out with success.... if you fail bring it back in some and repeat.