Arduino rc transmitter based on electronoobs projects with some modifications
this is rc remote control based on arduino pro mini and nrfz24lo1 module which cost you about 7$ (receiver and transmitter both)
range of about 800 meters tested in forest area and 1khm in open ground.
please refer to original post of eletronoobs for code and programming ( https://www.youtube.com/watch?v=aztm_8qGVfc&t=18s ) and how to mechatronics (https://www.youtube.com/watch?v=-BDCmwNssiw ) for remote pcb.
plz change ce and csn pins on pcb and for switches aswell.