are you asking how to generate radio-waves...? get an oscillator and an antenna. hook them together and you'll get radio-waves. the physics are that a changing

are you asking how to generate radio-waves...? get an oscillator and an antenna. hook them together and you'll get radio-waves. the physics are that a changing e-field induces a changing b-field (and vice-versa). the same antenna, if attached to an amplifier instead of an oscillator, will receive said radio-waves. i'm obviously glossing over enough detail to fill several library shelves worth of books.