Looks like you get four capacitors, four germanium diodes, and some wire. There's a link embedded at the website you posted to this video:
Simple concept. We're surrounded by transmitters that saturate the electromagnetic spectrum with energy. Put up an antenna of random length and connect it to a circuit that rectifies (and apparently doubles) the ac picked up by that antenna and you can get "free" energy at someone else's expense. I believe that circuit would be well-aided by a good ground connection.