ORIGINAL: opjose
Actually it depends upon the plane...
Most wood planes and most fiberglass fuselage planes are RF transparent, so you can safely route the antenna on the inside of the plane to the tail.
A Carbon Fiber or composite fuselage is a different story it seems.
It's best to have as straight of an antenna as possible so you can route it as far back as you can by fishing it through then out, up or let it hang.
You're saying there's no reason to have my antenna on my trainer outside the fuse and tied to the fin with rubber bands etc.?