Beware of the claims of "high gain". A dipole is a dipole and provided it is properly matched to the coax feed line it will perform exactly the same as any other dipole. The advantage of a dipole is that it eliminates the need for a ground plane [and in general is a little easier to match to the feed line].
In theory the dipole should be mounted vertically, which may not be possible in many fuselages. However, it is also possible to curve or even bent the elements to fit the space available. In a metal tube aircraft this is likely to be a limiting factor because somewhere or other the elements are going to end up close to some tubing, and the performance is going to be degraded.
The technique works well in glass or wooden aeroplanes. It may be satisfactory in a tube and fabric fuselage but the only way to tell is to do some tests of performance. It is impractical to use a dipole on the outside of a fuselage.