You may also want to place the antenna tube in the part of the airplane that most often is visible by you when flying. I fly with about 12 other pattern flyers and we all put the antenna tube in the bottom of the fuse. It's basically a standard for all of us. We all use pull pull for both the rudder and the elevator and most of us are still using wire rather than kevlar thread and reception issues don't generally occur.

Better yet, go to spread spectrum and forget about antenna issues.