A system includes an antenna of a ground station. The antenna is configured to generate signal beams. The signal beams define a plurality of cells in the sky. The antenna is fixed in position relative to the ground and mechanically fixed to a particular orientation. The antenna is a phased array antenna. The system also includes a processor coupled to the antenna. The processor is configured to support concurrent communication sessions with a plurality of spacecraft via the signal beams. The plurality of spacecraft is located within the plurality of cells.