Antenna test system for testing an antenna with a plurality of antenna elements , the antenna test system comprising: an antenna element connector for every antenna element of the antenna , wherein the antenna element connectors are wiredly couplable to the respective antenna elements , a channel emulator comprising an antenna port for every antenna element connector for wiredly coupling to the respective antenna element connector and a number of test signal ports , and a signal evaluation device for every one of the test signal ports , and for wiredly coupling to the respective test signal port , each signal evaluation device being coupled to a respective test signal port and being configured to receive a downstream test signal from the channel emulator and to evaluate the received downstream test signal and/or to provide an upstream test signal to the channel emulator via the respective test signal port , wherein the channel emulator is configured to receive downstream signals emitted by the antenna elements at the antenna ports and to perform a channel emulation on the received downstream signals and to output on each test signal port a single respective downstream test signal based on the channel emulation of the received downstream signals, and/or wherein the channel emulator is configured to receive upstream test signals from the respective signal evaluation devices via the test signal ports and to perform a channel emulation on the received upstream test signals and to provide the upstream test signals to the antenna elements based on the channel emulation of the received upstream test signals by outputting on each antenna port a respective upstream signal after performing the channel emulation on the received upstream test signals ; characterized by a synchronization evaluation unit that is coupled to or provided in the channel emulator and that is configured to determine calibration errors of the antenna based on the received downstream test signals . an antenna element connector for every antenna element of the antenna , wherein the antenna element connectors are wiredly couplable to the respective antenna elements , a channel emulator comprising an antenna port for every antenna element connector for wiredly coupling to the respective antenna element connector and a number of test signal ports , and a signal evaluation device for every one of the test signal ports , and for wiredly coupling to the respective test signal port , each signal evaluation device being coupled to a respective test signal port and being configured to receive a downstream test signal from the channel emulator and to evaluate the received downstream test signal and/or to provide an upstream test signal to the channel emulator via the respective test signal port , wherein the channel emulator is configured to receive downstream signals emitted by the antenna elements at the antenna ports and to perform a channel emulation on the received downstream signals and to output on each test signal port a single respective downstream test signal based on the channel emulation of the received downstream signals, and/or wherein the channel emulator is configured to receive upstream test signals from the respective signal evaluation devices via the test signal ports and to perform a channel emulation on the received upstream test signals and to provide the upstream test signals to the antenna elements based on the channel emulation of the received upstream test signals by outputting on each antenna port a respective upstream signal after performing the channel emulation on the received upstream test signals ; characterized by a synchronization evaluation unit that is coupled to or provided in the channel emulator and that is configured to determine calibration errors of the antenna based on the received downstream test signals . <EOS>