Dan, KE6FRY, has designed an antenna using pumped seawater as the radiating element. This could be interesting to some of our antenna mavens in the club. The link for more information is: http://www.public.navy.mil/spawar/Pacific/TechTransfer/ProductsServices/Pages/SeaWaterAntennaSystem.aspx
Be sure to watch the entire video as there is information of interest to hams near the end.