English: Feedlines at the foot of shortwave antennas at French international shortwave transmitting station at Issoudun. The antennas are called curtain arrays, consisting of a rectangular array of wire dipole antennas suspended in front of a vertical "curtain" of parallel wires. The antennas radiate a powerful beam of radio waves into the sky at a shallow angle above the horizon. The waves reflect off the ionosphere and return to Earth beyond the horizon, in the target country, and are picked up by listeners with shortwave radios.