Triangulation is a mathematical method used to determine the position of an unknown point in space based on the known positions of at least two other points and the angles at which these known points are seen from the unknown point. In the context of locating transmitters, the unknown point represents the position of the transmitter, and the known points are the positions of the receivers. Triangulation works by creating a virtual triangle between at least two known points and the unknown point (transmitter). By measuring the angles within this triangle, it is possible to mathematically calculate the exact coordinates of the unknown point. Radio transmitters, including FM transmitters, are examples of such sources. Italian radio transmitters located at the peaks of the Apennine Peninsula are of particular interest due to the terrain configuration, often causing significant interference to surrounding countries. Locating radio transmitters using triangulation allows for the elimination of interference and highlights the importance of careful measurement planning and the use of sophisticated data processing algorithms. Measurements and data processing must be performed using measurement systems whose characteristics are defined according to the recommendations of the International Telecommunication Union (ITU).