I'd be interested to see exactly how it works. The whole hand thing shows the influence that the human body can have.
Years ago, researchers in Sri Lanka found that they could make a pretty good antenna from a palm tree (utilizing the conductivity properties of the large amount of sap in the trees). It was devised for the military as a discrete method of transmission in jungle environments, and was used operationally.
RF is weird stuff. Even a rusty bolt can cause interference in certain conditions ( the oxide/metal interface acting as a rectifying diode). I know of several locations where this caused severe problems.