Sketch of the experiment. In contrast to the original Sikivie-Sullivan-Tanner setup \cite{sikivie}, no external magnet is needed. As the hidden-photon DM might have a net polarization, orthogonal circuits {could} be foreseen to minimize the effect of $\kappa$ (see text for details).
Parameter space scanned by the LC circuit proposed in \cite{sikivie} for hidden-photon cold dark matter (see the text for details).