I posted this on my Twitter when it came out, but I wanted to re-post it here, to share again. This is a sea water antenna that was designed and can be used in a variety of applications. I thought it was a very neat concept, and I would even like to try building one. It isn’t high on my priority list right now, but it would definitely make for a fun and interesting experiment.
SPAWAR Systems Center Pacific has developed a technology that uses the magnetic induction properties of sodium chloride (salt) in sea water to create a UHF/VHF/HF antenna.
(From http://www.southgatearc.org/news/october2010/sea_water_antenna.htm)