A method for selecting best radio signal in air traffic control includes: determining a respective latency of at least two receiving channels, wherein each receiving channel is provided between a corresponding receiver and a measurement and analysis module; measuring a respective arrival time of at least two radio signals received via the at least two receiving channels by the measurement and analysis module; determining the delay time between the at least two radio signals based on their arrival times; aligning the at least two radio signals with each other by taking the delay time determined into account, thereby obtaining at least two aligned signals; determining the quality of the at least two aligned signals; and switching to the receiving channel that processes the respective radio signal with the best quality determined. Further, an air traffic control system for selecting best radio signal is described.