I was going to but you beat me to it…
Above I already said that ships are operating in special circumstances, bad weather is one of them. I don’t know at what wind speed the sea water radiator will start to break up and eventually vaporize. I suspect that even with zero wind speed and with a naval ship that can run up to 30 knots that this could already be enough to desintegrate the radiator.
The same problem will occur with heavy rainfall and especially the torrential downpour in tropical areas. All communication will be knocked out.
The demonstration with the handheld with flat water at hand is not what we encounter on board a ship. On bridge level you need a bucket with sea water, not very practical. You also need a large battery for the pump that normally eats quite a bit of current. And all that to replace a small piece of wire.
I have more faith in this Chinese steerable beam antenna. The acrylic tubes can be filled with sea water to different levels by micro-pumps. When the tubes are emptied they are virtually undetectable by radar etc.