I personally would not put an rx aerial inside a fuz. If you have servos in the tail (as I do) it will be nearer the servo leads - a bad thing and kevlar will shield the signal slightly will it not. To my eye it doesn't detract from the appearance and if an expert who's judgement I respect tells me that it is advantageous to run the aerial outside the fuz then so be it. Best way is to run to outside and then up to the to top the fin so that at no angle does the aerial appear as a point to the tx aerial. Need to kink it.

Tons of people run them inside with no problems, but that doesn't mean it's the best way.