Not exhaustive but some ideas. A quick brain dump in the 10 mins before i go out so apologies for lack of structure /grammer/spelling

Do not run the aerial in parallel with other wires/metal includes carbon fibre.
If you can get a right angle into the aerial lead this is good news improving reception and giving the aerial 2 planes of operation. whips achieve this or routing part of the antenna along the wing.

The receiver picks up it signal via the aerial this is relative to the receiver earth, the very point your long servo lead is connected (zero volts) it could also be of a similar length which should be avoided if poss. This can lead to the signals you want your receiver to detect being cancelled out by signalls appearing on the servo leads. solution : use opto isolators from the servo leads or wrap a few turns of the servo lead through a ferrite ring or tube. This makes sure that servo leads have a high impedance to RF signals, make sure the ferrite is close to the receiver.

The ferrites can also prevent any noise generated inside the servos getting back into the receiver.

Think about interfering sources in your fuselage i.e. wires in which high currents are being switched /glow/solenoid/pump/lights/ECU/servos keep them as far as possible from receiver or aerial. Any interference from these sources will drop according to square law, so the bigger the distance the less chance of interference. I have a noisy harness on one side of the fus less noisy on the other. Make sure supression is fitted to pump and solenoids usually a capacitor is all that is needed manufacturers usually give advice here, follow it to the letter. Motors are notoriously noisy.

Contraversial -- but i use a seperate battery for servos and receiver using an opto-isolator, i know some will say this inceases the possibility of a failure (more things to go wrong). But with only one battery and a stalled servo, or lots of servo activity drawing many amps I would rather my receiver has a clean and independant supply, than take the risk of the voltage dropping to the receiver reducing its performance.

Look out for metal to metal moving connections. these can generate RF noise unless they are in intimate contact with each other, a metal horn to metal clevis would be an example, if you have these make sure electrically the two sides are joined together using flexible braid.across the moving connection.

...... all for now hope this helps.

John