So, I guess 6 inches would be more or less enough for zappicating my food and water on top of the speaker. Perhaps, it would be okay for the body as well...
I am planning to put it inside a plastic box for convenience. Do you think that a plastic box would reduce the range even more or not?
Anyway, if I build this whole thing and it would be working for me, I would definitely try to build or buy a decent 5V generator! haha