What procedure may be used by Volunteer Monitors to localize a station whose continuous carrier is holding a repeater on in their area?

To find the location of an interfering signal, such as a continuous carrier holding a repeater open, Volunteer Monitors use radio direction finding (RDF) techniques. They use directional antennas at their home locations to determine the compass beam heading of the strongest signal on the repeater's input frequency. By communicating with other Volunteer Monitors in different locations, they can plot these multiple directional headings on a map. The geographic point where these lines intersect, known as triangulation, reveals the physical location of the offending station. Distractors involving comparing input and output signal strengths or vertical and horizontal polarizations are incorrect because they do not provide the geographical location data needed to triangulate the physical source of a transmission.