I think the virtual ones exist. They just exist for a super-short period of time. But that's just my opinion. And sometimes they become non-virtual, as in Hawking radiation.
I don't know anything about "zero-point energy". I know space is filling with various virtual particles and that there's a "vacuum expectation value" of the Higgs field. I don't know anything about radio waves causing voltage in antennas either. All I know is that radio waves are no different than any other electromagnetic wave except for having the least energy by having the lowest frequency (longest wavelength). So if they can do something "special" electrically, I would think that the other frequencies of electromagnetic radiation could do it too
I don't know anything about "zero-point energy". I know space is filling with various virtual particles and that there's a "vacuum expectation value" of the Higgs field. I don't know anything about radio waves causing voltage in antennas either. All I know is that radio waves are no different than any other electromagnetic wave except for having the least energy by having the lowest frequency (longest wavelength). So if they can do something "special" electrically, I would think that the other frequencies of electromagnetic radiation could do it too