Antennas And Propagation -

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

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 antennas and propagation

It catches passing EM waves and converts them back into electrical signals for a receiver to process. It takes an oscillating electrical current from a