Well this will work...
This looks like it is converting a small antenna into a large antenna. No magic here, just a better coupling to space by effectively changing the speed of electromagnetic propagation across the small antenna, and I'm guessing finding it's own sweet-spot, which can't have been anticipated. Very clever.
So you can make a big antenna smaller (hiding it), or you can make a small antenna (which are very poor drivers) more efficient. This will be great for phones. How hot does yours get as it desperately tries to drive a signal out there?
Tesla would like it.