I looked into it a little and they said the water burns then reforms into water. So the byproduct is water. Which means you put in salt water, and get out energy and pure water. Forget running cars on this. If the numbers work right you can produce clean drinking water from salt water possibly for free, possibly with a net gain of energy.

If you get a process that creates energy and clean drinking water, no car or gas company is going to stop that.

Now if the numbers don't work out, and it takes more energy to run the radio wave generator than you gain from burning the water, all is not lost. Desalination can be very expensive, so as long as there is very little loss of energy in the process it may make desalination far cheaper in the future.

Clean water for everyone is in my opinion an even better goal that cheap car gas.