I have a flysky RX/TX the receiver ariels are at 90 degrees in the centre of the hull just below a deck patch. When the boat is at long range and healed (so that the carbon hull comes between the TX and RX ariels) it looses the signal. When this happens, failsafe lets out the sheets so the boat stands up and receives the signal again, this causes it to pull in the sheets, heel over and loose signal again etc etc. So carbon 100% definately screens signals between RX and TX. I have drilled 2 small holes and mounted the ariels flat and right at the edge of the deck. I havent had a chance to try this yet but suspect it may not be enough and that the ariels need to be stood up proud of the deck. I will be building from glass in the future - carbon is too much trouble :-(