Better not to try and reinvent the wheel. Simply follow the manufacturers instructions. The wire sheathing and cap design is the rf shielding. The cap likely already has a resistor inside, negating the need for a resistor plug. Go to the CH ignitions web site and read up on their installation instructions and explanations.

You won't find many full carbon fuselages. When you do they will likely be on UAV's. Even the larger Comp Arfs have only a little cf as part of the structure. Use an external antenna on an all carbon fuse if you want clean signal transfer.