Look close at Rajul's diagrams. No knots, just "S" windings through the servo arm pieces. I use this system on all my sport planes. To get past a canopy I combine it with Minnfliers tube idea - so I can easily snake it out the fuselage at the piece of fuel tubing where it is hard to reach (I swap receivers often, too.) I try to avoid anything metal or hard touching the antenna; more out of fear the insulation will be worn off with vibration than an RF issue.

One variation I like on the rudder end is to friction fit the little servo-arm anchor into 1" of fuel tubing and pin the other end of the tubing to the rudder. Thread the antenna end through the tubing first and then push the pin in fron the end so that the head is completely inside the tubing when in place. Lasts much longer than a rubberband under the effects of sun and exhaust. I think it looks a little better, too (especially if you can find red, yellow, blue or black silicone tubing to match the rudder). If anything bumps it the little anchor pops out of the tubing, or the tubing tears off the pin shank.