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There are a lot of ways to "burn water", and I don't think that radio waves are any different than any of the other ways - they all take far more energy in that comes out. Problem is water is one of the most stable compounds on earth, (unlike gas or oil which is very unstable) and in fact when you burn hydrogen and oxygen, the byproduct is - you guessed it - water. It just doesn't make sense that you could take water, extract hydrogen and oxygen, burn it, and end up with water and more energy than you started with - no matter what the process is. Even in nuclear reactors, there is still a "fuel" in the form of uranium rods, which is used up and transformed into a different state as energy is extracted.
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