Arrays of dual-polarized low-frequency antennas observing the sky. The antennas are at fixed positions above the ground, and the z-axis is up. The signal from each element is amplified by an LNA, weighted, and summed. The output of each summation is directed into the correlator. The y-directed elements (black) follow the same signal flow, but are not shown. A four-element array is shown as an example.