Antenna stopper out of fus
I always glue a 2 inch piece of fuel tubing through a hole in the fuselage and feed the antenna through that, anchoring it on the inside in the way you suggested.
That way, when the tubing bends, it provides a small tension to the antenna and there is a very gentle, soft curve on the antenna as it exits the fus. Also, the anchor plays on the end of the tubing in the fuselage, and has a lot of 'spring' in it.
-David C.