Aerials transmit signals by using an oscillating electrical current in a length of conductive material to generate electromagnetic radiation.

To put that in  everydayknown aslikeorparticularrodsuch asthink language, this is what happens. An aerial is basically a  everydayknown aslikeorparticularrodsuch asthink made of a material,  everydayknown aslikeorparticularrodsuch asthink copper, which can conduct,  everydayknown aslikeorparticularrodsuch asthink carry, electrical current. The current vibrates at a  everydayknown aslikeorparticularrodsuch asthink rate, and the vibration sends out magnetic waves,  everydayknown aslikeorparticularrodsuch asthink radio waves. It’s a bit  everydayknown aslikeorparticularrodsuch asthink throwing a stone into a pool of water. The vibration of the stone hitting the water sends out waves in all directions. Or  everydayknown aslikeorparticularrodsuch asthink of clapping your hands together and sending out sound waves.

Text from: Bingham, C., Wright, L. (2013). Technical English Level 4 Teacher´s Book. Pearson Longman. p. 74.