"Mortal Oscillatory Rates (MOR) are the frequencies that Royal R. Rife proposed would allow a user of his Rife machines to kill the specific micro-organisms responsible for disease in their host."
https://hatch.kookscience.com/wiki/Mortal_Oscillatory_Rates
"Tesla would fool with some tuners and tune in the right frequency and got 240 volts delivered through the air"
http://waterpoweredcar.com/teslascar.html
"electromagnetic waves that are projected in certain directions by antennas. By tuning receivers to specific frequencies, you can collect certain signals."
https://radiofidelity.com/what-is-shortwave-radio/
"Antennas receive an electromagnetic wave and convert it to an electric signal"
https://www.lesics.com/how-does-an-antenna-work.html
"energy from space. Transmitters and receivers are typically designed to operate over a limited range of frequencies."
https://www.nasa.gov/directorates/heo/scan/communications/outreach/funfacts/what_are_radio_waves
"Tesla says that the source of this energy is our Sun."
https://teslaresearch.jimdofree.com/radiant-energy/