Carbon and 2.4GHz does not mix well! Best practice is to try and get the antennas away from carbon and if the fuselage is carbon you need to get the antennas outside. Having flown 4m wingspan full carbon F5J planes to the limit of visibility (tiny speck size, more than 1500m away) I have learned that setting up the antennas is the key to success! Mounting the antennas on a carbon plate is a recipe for disaster....
And yes, as someone said, NEVER point the TX antenna at the plane, carbon or not! I log my RSSI telemetry and it is interesting to see how signal strength can vary as a plane turns.
It should also be noted that not all 2.4GHz frequency hopping protocols are created equal, but that is a touchy subject that I have done a LOT of research on and have learned that not everyone understands the technology and most discussions ends up messy.
Rudi