From what I gather (especially since Georges didn't seem to allow the plant to be touched by the antenna): the metal of the antenna shouldn't touch the skin. Also, consider its said to malfunction if the surface of the metal gets tarnished or dirty thus.. insulation or non-conductive coating seems best. The insulation can touch the skin. The ends of the wire should have some overlap w/o metal touching.
Fixing a copper wire inside of a belt seems to be the most convenient but there has to be overlap. Solid wire is said to be preferred over stranded. I experienced quite good results with Cat 5 Cable (4 twisted pairs). I experienced a mild Herxeimer reaction. Health definitely improved--breathing in particular, odd 'kinks' in my back went away. And I put it on just as a curiosity not expecting such results. Overall well-being increased greatly.
Also a necklace or a headband should also be effective or placing the wire at level of the chest (perhaps for more direct affect for chest-area improvement).