That's exactly what I was thinking. But if it can be made to be even somewhat energy positive, we have a lot of coastline with energy hungry inhabitants.
Maybe as we fill the air with RF we will reach the point where there is enough saturation and power level for us to power all the cars on the road with salt water
bottom line, if it is safe enough for us to be around and the power consumption is not so much as to be a net loss myth, then how do we prevent from starting the ocean on fire!