Direction finding system for direction finding of an electromagnetic signal, comprising an antenna system for receiving the electromagnetic signal, and a direction finder, for determining the direction of the electromagnetic signal, wherein the antenna system comprises a plurality of antennas, wherein the direction finder comprises: - a direction determiner, adapted to determine a plurality of possible directions, and - a direction evaluator, adapted to evaluate the plurality of possible directions and to determine the direction of the electromagnetic signal therefrom, wherein the direction determiner comprises: - a direction database holding pre-stored data linking pre-stored antenna system output signals to directions of electromagnetic signals, and - a direction searcher, adapted to search for matches of present antenna system output signals resulting from the electromagnetic signal to the pre-stored antenna system output signals in the direction database, wherein the present antenna system output signals resulting from the electromagnetic signal are present output signals of the plurality of antennas of the antenna system, wherein the direction searcher is adapted to perform the search using a search function, advantageously a χ 2 function or a maximum likelihood function or a function based upon a noise-density, wherein the direction determiner comprises a minimum determiner, adapted to determine a number of local minima of the search function, corresponding to the number of the plurality of possible directions, wherein the direction evaluator comprises a minimum evaluator, adapted to evaluate the number of local minima, in order to evaluate the number of possible directions, and wherein the minimum evaluator is adapted to determine which minimum of the number of local minima corresponds to the direction of the electromagnetic signal by statistically evaluating the number of local minima. wherein the antenna system comprises a plurality of antennas, wherein the direction finder comprises: - a direction determiner, adapted to determine a plurality of possible directions, and - a direction evaluator, adapted to evaluate the plurality of possible directions and to determine the direction of the electromagnetic signal therefrom, wherein the direction determiner comprises: - a direction database holding pre-stored data linking pre-stored antenna system output signals to directions of electromagnetic signals, and - a direction searcher, adapted to search for matches of present antenna system output signals resulting from the electromagnetic signal to the pre-stored antenna system output signals in the direction database, wherein the present antenna system output signals resulting from the electromagnetic signal are present output signals of the plurality of antennas of the antenna system, - a direction determiner, adapted to determine a plurality of possible directions, and - a direction evaluator, adapted to evaluate the plurality of possible directions and to determine the direction of the electromagnetic signal therefrom, wherein the direction determiner comprises: - a direction database holding pre-stored data linking pre-stored antenna system output signals to directions of electromagnetic signals, and - a direction searcher, adapted to search for matches of present antenna system output signals resulting from the electromagnetic signal to the pre-stored antenna system output signals in the direction database, wherein the present antenna system output signals resulting from the electromagnetic signal are present output signals of the plurality of antennas of the antenna system, wherein the direction searcher is adapted to perform the search using a search function, advantageously a χ 2 function or a maximum likelihood function or a function based upon a noise-density, wherein the direction determiner comprises a minimum determiner, adapted to determine a number of local minima of the search function, corresponding to the number of the plurality of possible directions, wherein the direction evaluator comprises a minimum evaluator, adapted to evaluate the number of local minima, in order to evaluate the number of possible directions, and wherein the minimum evaluator is adapted to determine which minimum of the number of local minima corresponds to the direction of the electromagnetic signal by statistically evaluating the number of local minima.