Then if you have a two-antenna system, orient one perpendicular to the other and as far apart as possible. If one antenna, then where it goes doesn't much matter because the antenna usually part of the receiver.

There are some receivers that have one long antenna (about 6 inches long) and one short one. Put the receiver on a mount in the center of the fuselage in the servo compartment, then just carefully run the long antenna in a direction away from the other antenna, and then along the side of the fuselage. You can tape it in place.

CGr.