What sort of immediate measurable physical effects would a Fieldbroadcaster cause?
The voltage may be measurable in millivolts, but at the least it would be measurable microvolts. However, in eleven and a half feet of distance from top to bottom and many times that in length of coil wires and circuitry there is enough difference in potential from end to end to be measurable. There is, however, more involved than voltage, which is simply electric pressure or velocity. We are talking about complex patterns of energy. In addition to velocity there is also amplitude, mode, sympathy, number and periodicity. Or some may prefer terms such phase, intensity and wavelength as well as harmonics or resonance in complex waves.