Antennas And Propagation -

Propagation describes how those radio waves travel through the environment once they leave the antenna. Waves don't always travel in a straight line; they interact with the world in several ways: Antennas & Propagation short course - University of Surrey

It takes an oscillating electrical current from a transmitter and turns it into an electromagnetic (EM) wave that radiates outward. antennas and propagation

It catches passing EM waves and converts them back into electrical signals for a receiver to process. Propagation describes how those radio waves travel through