Nice video, thanks. I am thinking this is only a fair weather operation unless you use the tube enclosure.
I am also thinking instead of pumping water up, why not just load a tank with sea water and let it flow down out a nozzle?
continuos gravity feed, the range would necessarily double every five feet. Take a pillar of salt/electrolyte solution and mount all of the 100 diferent antennae arrays side by side.