Zor, putting the antennas outside the air frame is a possibility but it would take some engineering. You could do that with the Futaba type of antennas but I am not too sure if it could be done with some of the others. In fact, I think that Futaba will install longer length antennas in your receiver if you send it in. Even then, it’s not a good idea. Having the antennas parallel to the body is not the best configuration for RF reception. Having them perpendicular would be better but very difficult to implement. Even then, of the metal flakes in the finish add up to a substantial RF barrier you would expose the antennas to periods of time of significant blockage. Dan.