dsk,

Lucky gave you a very good basic description of all of your questions.

As far as mounting the antenna either inside or outside the fuselage that is more personal preference than anything else on glow/nitro powered planes. As far as mounting it outside the 2 most common ways I have done is out through the bottom and either taped with scotch tape to the underside of the fuselage or in the case of a tail dragger then using a rubber band is usually connected to the tail wheel mount

The other way is out the top of the fuselage I usually run it out just behind where the canopy (if the plane has one, most traineres don't) then push a "T" pin into the top or near the top of the vertical fin with a rubber band connected to it. Now tie the antenna to the other end of the rubber banding while strecting the antenna/rubber band to keep slight tension on the antenna to keep it straight.

The key is not to cross the antenna wire over itself at any point and to make sure it's full length is extended (all 39 inches of it)

The way most people connect the antenna to the rubber band is with either a button or part of a servo arm. Maybe Minnflyer or someone else has a diagram on how to do this. The button/servo arm also makes a great strain relief for the antenna on the inside of the fuselage right where the antenna exist. That way if the plane suffers a crash or is mishandled the antenna will survive well.