want to know if the dji range extender will work with my fc 40 I am using the stock camera the extender that mounts on the transmitter and if it does is it worth it
It won't work straight out. Its firmware looks for a camera MAC address that starts as 60:60:1F and an SSID that is blank. Perhaps with some hacking it can be made to work.
But people have already hacked other wifi extenders to work with the FC40.