To tap the energy of such a broadcast requires the construction of a tunable Tesla coil which either operates at 14.3KHz or some even super harmonic of it. Of course, the higher the harmonic the coil is tuned to, the lower will be the power received in an inverse proportion to the increased frequency. The Testa coil's 'primary' would be the high-voltage, inner coil, in this instance, as the voltage will need to be stepped-down. The total length of the wire used in the primary should equal either the full or one quarter wavelength of the resonant harmonic chosen. The secondary should have the equivalent in ampere-turns. Placing a resistive load (like a filament light globe) across the secondary (which should be vertically movable to allow tuning of the inductive coupling of the coils) should indicate to the observer when the system is receiving by its glow. The main problem will be guessing the incoming voltage level. Depending on the field density, it could be as high at 500 Megavolts... which could produce problems... However, if the harmonic chosen is high enough, the effective voltage will drop considerably.
