I think that a secure antenna installation is important to secure reliability in the long run. To accomplish this you must place it inside the plane. If you bend any type of wire enough times it will break. A wire on the outside is vulnerable to damage and is constantly oscillating in the slipstream. If only a few of its wire strands break, it will cause the same type of noise as vibrating metal to metal contact points. You will be unaware of the deterioration of your antenna because it happens inside the insulation. Most RC pilots never replace their receiver antennas and install it from plane to plane on the outside. An accident waiting to happen! I normally use the inner of a thin cell-phone type coax as antenna wire. When I assemble the plane, depending on its size, I glue the end of the antenna under the vertical fin and keep all the battery and servo leads to one side of the fuselage and route my antenna on the opposite side, securing it with glue and cable ties. On the receiver I leave a short "pig tail" that I solder to the antenna and cover with heat-shrink after I have secured the antenna and receiver. Remember the total length of your antenna must be the same as the original (99cm for JR equipment). Wires and rods running along side the antenna will have little effect on its performance as long as they are not near a resonant length, for 35MHz this is about 2 meters and about 41 inch for 72 MHz.