Amplitude Radio Direction Finder (ARDF) is a device used for locating the position of a radio transmitting station. The ARDF has several synonyms, including Radio Direction Finder (RDF), Direction Finding (DF), and Radiolocation. Other terms used to describe ARDF include radio compass, radio bearing, and radio homing. ARDF is commonly used in radio communication, navigation, and surveillance. It's also used in military and emergency response operations. Regardless of the name used, the ARDF remains a critical tool for locating radio transmissions and tracking down their source. Its accuracy and reliability make it a valuable asset in many industries.