A sparsely populated array of antenna elements on a plane is provided such that the angle of arrival (AoA) measurement for a radiofrequency signal received by the array has high resolution and is non-ambiguous within a 360-degree azimuthal field of view. The array comprises a two-dimensional antenna array developed using fuzzy genetic logic based on specified criteria. In response to one specified set of criteria, the array comprises having a first large element formation combined with a second smaller element formation. The first large element formation supports high DF accuracy while the second smaller cluster facilitates ambiguity resolution.