Mitsubishi's SeaAerial is an antenna made of seawater
 

Mitsubishi has developed an unusual alternative to conventional antennae, and it uses seawater instead of metallic conductors. The new system called SeaAerial shoots conductive plumes of seawater into the air to emulate a tall tower and transmit/rece...

http://www.engadget.com/2016/01/28/m...water-antenna/