The space between the conductive Earth’s floor and the conductive D layer acts as a parallel-plate waveguide which confines ELF waves, permitting them to propagate long distances with out escaping into space. In contrast to VLF waves, the top of the layer is far less than one wavelength at ELF frequencies, so the one mode… Continue reading Why Ignoring What Is Vibroacoustic Stimulation Will Value You Time And Gross Sales