Spektrum AR6255 Guide De L'utilisateur page 4

EN
B- 2.4GHz Friendly Fuselage
The section forward of the wing is constructed of non-conductive materials like
fiberglass, Kevlar, etc. but the wing and possibly the tail section have carbon or
carbon weave construction.
Internal Antennas
2.4GHz Friendly
Step 2. Determining Antenna Mounting Positions
After determining which type of aircraft from the list above, use the above
illustrations as a guideline as to where the feeder antennas should be mounted. Note
that full carbon aircraft requires externally mounted antennas while the 2.4GHz-
friendly fuselage can have the antennas mounted internally. The goal is to mount the
antennas in a location so that at least one will always be in the RF visual line of sight
of the transmitter (e.g. not blocked by carbon fiber structures) in all attitudes. This
can easily be visualized by having a helper stand about 20 feet away and rotate the
airplane in all attitudes confirming that in all positions there is a direct line between
you and at least one receiver antenna that isn't blocked by carbon fiber structure.
Step 3. Installing the Receivers
Install the receiver in the normal position recommended by the
airplane's manufacturer. Double-sided tape or foam can be used to secure the main
receiver in place.
Step 4. Mounting the Antennas
To install the antennas, drill a 1/16-inch hole in the desired antenna mounting
position.
Slide the feeder antenna through the hole until the 31mm tip, and about 2mm
of coaxial, completely exit the fuselage. Using a drop of CA, glue the antenna to
the fuselage making sure that the 31mm active portion of the antenna tip is fully
exposed.