An anti-jamming subsystem for use with a reference antenna configured to operate with systems utilizing high elevation signal transmitters such as global navigation satellite systems, the anti-jamming subsystem comprising: a. a horizontal two-dimensional array of antennas configured to have a horizontal circular reception pattern and receive signals originating along the horizon and including one or more jamming signals originating along the horizon, the horizontal two-dimensional array being configured to be positioned in close proximity to the reference antenna; b. one or more processors (200, 202, 204, 206) that are configured to: process signals received by the reference antenna, the signals including signals from the high elevation signal transmitters and the one or more jamming signals originating along the horizon, and process the signals received by the respective antennas in the array, the signals including the one or more jamming signals originating along the horizon, by combining the signals received by the respective antennas in the array utilizing phase information associated with the antennas in the array to produce one or more anti-jamming signals that have opposite phases and same magnitudes as the one or more jamming signals originating along the horizon that are received by the reference antenna, combine the one or more anti-jamming signals with the signals received by the reference antenna to substantially cancel interference from the one or more jamming signals originating along the horizon that are received at the reference antenna and preserve phase and timing information in the signals originating from the high elevation signal transmitters that are received by the reference antenna. a. a horizontal two-dimensional array of antennas configured to have a horizontal circular reception pattern and receive signals originating along the horizon and including one or more jamming signals originating along the horizon, the horizontal two-dimensional array being configured to be positioned in close proximity to the reference antenna; b. one or more processors (200, 202, 204, 206) that are configured to: process signals received by the reference antenna, the signals including signals from the high elevation signal transmitters and the one or more jamming signals originating along the horizon, and process the signals received by the respective antennas in the array, the signals including the one or more jamming signals originating along the horizon, by combining the signals received by the respective antennas in the array utilizing phase information associated with the antennas in the array to produce one or more anti-jamming signals that have opposite phases and same magnitudes as the one or more jamming signals originating along the horizon that are received by the reference antenna, combine the one or more anti-jamming signals with the signals received by the reference antenna to substantially cancel interference from the one or more jamming signals originating along the horizon that are received at the reference antenna and preserve phase and timing information in the signals originating from the high elevation signal transmitters that are received by the reference antenna. process signals received by the reference antenna, the signals including signals from the high elevation signal transmitters and the one or more jamming signals originating along the horizon, and process the signals received by the respective antennas in the array, the signals including the one or more jamming signals originating along the horizon, by combining the signals received by the respective antennas in the array utilizing phase information associated with the antennas in the array to produce one or more anti-jamming signals that have opposite phases and same magnitudes as the one or more jamming signals originating along the horizon that are received by the reference antenna, combine the one or more anti-jamming signals with the signals received by the reference antenna to substantially cancel interference from the one or more jamming signals originating along the horizon that are received at the reference antenna and preserve phase and timing information in the signals originating from the high elevation signal transmitters that are received by the reference antenna.