Some of the guys over at modezero who I must say are experts at these rc systems, have had good results with the RF-Nano modules.
Might be a good move to read up on some of their on-hand experiences.
Range details in this instance are about half way down page 2 , could be more but a lot to read through.(700 metres across the ground)
https://mode-zero.uk/viewtopic.php?f=42&t=971&start=10