Could someone please answer if mounting the antenna on the inside of the plane or the outside of the plane is the best idea. I have heard both are O.K. but have noticed radio interference on planes with the antenna on the inside. Any help is greatly appreciated. Thx.

its easier to mount it outside, and you dont have to run the risk of interference, but it doesnt look as nice. I would mount it on the outside, but thats just me

In or out makes no difference, as long as you keep the antenna as clear of your wiring as you can. You wouldn't want to run the antenna through a carbon fiber tube either, but balsa and fiberglass are transparent to RF energy

I run it along the bottom center and outside. No one can see it and it's easy to install/remove.

I mount mine on the inside but it really doesn't matter

Inside or outside work equally well.

A couple of caveats if running it inside:

1. Do not run the antenna in a carbon fiber tube OR close to carbon fiber push rods.

2. If you have a metalic finish on the plane (Chrome Monokote or a metalic paint) DEFINITELY do a range check before flying. I have found Chrome MonoKote and SOME metalic colored paints to severly reduce range.

3. DO NOT CUT THE ANTENNA. If the antenna is too long you have two options - run it outside the plane or replace the antenna with something like the "Hayes Loaded Antenna" (about 18" long) or one of the other commercially available products out there.

FWIW - When I run the antenna on the outside of the plane I usually come out the bottom of the fuselage and run the antenna along the bottom of the fuselage, securing to a bracket coming off the tailwheel. Look at a Sig Rascal 40 sometime and you will see the type of bracket I am refering to.

All the above is good advice. Here is the criteria I follow. A nice scale plane for competition; mount the antenna inside and plan accordingly during construction. I usually use the blue outer nyrod mounted inside the fuse to carry the antenna. Fun scale, sport models and arfs go outside.