Which of the following describes the main function of a Direction Finder?

The main function of a Direction Finder is to determine the direction of radio signals. Direction Finders are crucial for locating the source of radio transmissions and are widely used in various applications, including navigation and communication. By accurately identifying the direction from which a radio signal is being transmitted, operators can effectively triangulate their position or the position of others. This functionality is essential for search and rescue operations, tracking, and navigation, making it a vital tool in maritime and aviation contexts.

Other choices might reference related concepts in radio technology, such as enhancing signal quality or noise reduction, but they do not reflect the primary purpose of a Direction Finder, which is focused on ascertaining the direction of incoming signals.