A system, method and computer program product for line of sight (LOS) communications using multiple-input-output (MIMO) communications is disclosed. The system includes a first platform having at least one transmit antenna element and at least one receive antenna element forming a first antenna array. A second platform having at least one transmit antenna element and at least one receive antenna element forms a second antenna array in wireless communication with the first array. Corresponding angles for antenna elements in the first antenna array and antenna elements in the second antenna array relative to a 3-D Cartesian coordinate system are determined to achieve a maximum three-dimensional (3-D) MIMO capacity, and the plurality of antenna elements are adaptively adjusted to maintain the maximum 3-D MIMO capacity by minimizing a zenith angle between each of the transmit antenna elements and receive antenna elements relative to a plane defined by the coordinate system over a LOS link.