Radio is another story. Antenna theory is based on anlternating polarization of the emmiter and the receiver antennas, in order to produce an electromagnetic wave in space. In antennas we do exactly that, applying a voltage on a wire without grounding the other end.
This is totally different from all the other circuits where you want electrons to actually flow in order to produce work.
This is totally different from all the other circuits where you want electrons to actually flow in order to produce work.