A base station, comprising: an RF, Radio Frequency, transceiver (210a-210n) configured to provide RF signals to be transmitted; and an antenna array (205a-205n) configured to radiate the RF signals, the antenna array comprising a sub-array, wherein the sub-array comprises: a feed network comprising a first transmission line (551, 630), a second transmission line (552, 640), phase-shifting portions, hybrid couplers, and vertical feeds; a first antenna patch (531, 611) that includes horizontal feeds (542, 622) and openings; and a second antenna patch (532, 612) that includes horizontal feeds (542, 622) and openings, wherein termination points of the first transmission line (551, 630) and the second transmission line (552, 640) correspond to the openings to connect first transmission line (551, 630) and the second transmission line (552, 640) with the horizontal feeds of the first antenna patch (531, 611) and of the second antenna patch (532, 612) via the vertical feeds, wherein each of the openings is configured to allow one of the plurality of vertical feeds to pass through one of the first antenna patch (531, 611) and the second antenna patch (532, 612) and to couple to a horizontal feed (542, 622), wherein the first transmission line is configured to feed two vertical feeds that correspond to the first antenna patch (531, 611) and is configured to feed two vertical feeds that correspond to the second antenna patch (532, 612), and wherein the second transmission line is configured to feed two vertical feeds that correspond to the first antenna patch (531, 611) and is configured to feed two vertical feeds that correspond to the second antenna patch (532, 612), wherein each of the first antenna patch and the second antenna patch is provided in a quadrilateral shape and includes an upper left first corner arranged opposite a lower right third corner and an upper right second corner arranged opposite a lower left fourth corner, wherein the vertical feeds fed by the first transmission line are associated with the first corner and the third corner of the first antenna patch (531, 611) and the second antenna patch (532, 612), respectively, and the vertical feeds fed by the second transmission line are associated with the second corner and the fourth corner of the first antenna patch (531, 611) and the second antenna patch (532, 612), respectively. an RF, Radio Frequency, transceiver (210a-210n) configured to provide RF signals to be transmitted; and an antenna array (205a-205n) configured to radiate the RF signals, the antenna array comprising a sub-array, wherein the sub-array comprises: a feed network comprising a first transmission line (551, 630), a second transmission line (552, 640), phase-shifting portions, hybrid couplers, and vertical feeds; a first antenna patch (531, 611) that includes horizontal feeds (542, 622) and openings; and a second antenna patch (532, 612) that includes horizontal feeds (542, 622) and openings, a feed network comprising a first transmission line (551, 630), a second transmission line (552, 640), phase-shifting portions, hybrid couplers, and vertical feeds; a first antenna patch (531, 611) that includes horizontal feeds (542, 622) and openings; and a second antenna patch (532, 612) that includes horizontal feeds (542, 622) and openings, wherein termination points of the first transmission line (551, 630) and the second transmission line (552, 640) correspond to the openings to connect first transmission line (551, 630) and the second transmission line (552, 640) with the horizontal feeds of the first antenna patch (531, 611) and of the second antenna patch (532, 612) via the vertical feeds, wherein each of the openings is configured to allow one of the plurality of vertical feeds to pass through one of the first antenna patch (531, 611) and the second antenna patch (532, 612) and to couple to a horizontal feed (542, 622), wherein the first transmission line is configured to feed two vertical feeds that correspond to the first antenna patch (531, 611) and is configured to feed two vertical feeds that correspond to the second antenna patch (532, 612), and wherein the second transmission line is configured to feed two vertical feeds that correspond to the first antenna patch (531, 611) and is configured to feed two vertical feeds that correspond to the second antenna patch (532, 612), wherein each of the first antenna patch and the second antenna patch is provided in a quadrilateral shape and includes an upper left first corner arranged opposite a lower right third corner and an upper right second corner arranged opposite a lower left fourth corner, wherein the vertical feeds fed by the first transmission line are associated with the first corner and the third corner of the first antenna patch (531, 611) and the second antenna patch (532, 612), respectively, and the vertical feeds fed by the second transmission line are associated with the second corner and the fourth corner of the first antenna patch (531, 611) and the second antenna patch (532, 612), respectively.