So, next question:

The "energy dissipation" means heat.

In case of the bare wire the air is heated. For isolated the insulation.
Is it possible to burn off an insulation which have large dielectric losses?
S*



I suppose yes, if the loss is high enough, and the applied power is high
enough. However, a dielectric that lossy would greatly effect the
electrical length of the antenna element, and removing it would change
the characteristics and impedance of the antenna, so it may totally
change the way your antenna behaves.

Jeff