Well, if using 72 MHz, it should be as straight as possible. It can be inside or outside, whatever is convenient. Just do NOT cut the antenna. It must remain.. MUST REMAIN the same length as new. That is critical.

For 2.4 GHz, well, you are pretty flexible with that because it is very short. The only requirement, if it has a pair of antennas (meaning a "satellite" receiver"), it is supposed to be perpendicular to the plane of the other antenna.

That's about it.

Some say that it should not be inside the fuselage (72 MHz) when using metal pushrods. I tend to agree with that, but there is no facutal truth, as far as I know, about inteference from metal pushrods, but I just avoid the proximity. Keep it simple and avoid any potential problems...

CGr.