Inside the fuselage is the best way. It can't get snagged by careless handling, and just looks more professional. I use the dubro tube, and on really short airplanes route the antenna forward from the receiver past the firewall, then reverse to the tail end of the airplane. Keep the forward tube on one side of the fuselage and the return part of the tube on the other. No glitches or range problems. The dubro tube forms nicely with a heat gun.