A satellite concept with a high-gain, movable spot-beam is examined. Communication with individual earth stations is achieved by time sharing a single channel in the time-division multiple access (TDMA) mode. A TDMA burst organization is proposed, and estimates of burst lengths, beam switching intervals, and buffer storage size are made for a network operating on a 600 Mb/s channel. Antenna configurations forming rapidly scanned spot-beams are discussed. A phased array with each element radiating the entire U.S. appears to provide an attractive solution. Such an antenna, capable of forming 100 spot-beams with nearly 50 dB gain toward any point on the continental U.S., appears feasible.