The Tetley Replay is a portable RF spectrum playback system. Tetley Replay integrates two independently tunable 40 MHz wide tuner channels with two independently tunable 40 MHz wide transmitters. The tuner and transmit channels can be placed anywhere in a 20 MHz to 6 GHz spectrum, supporting 2 x 40 MHz of simultaneous, contiguous or non-contiguous spectral collection or transmission. The Tetley Replay features RF spectrum playback, providing the user the ability to process and analyze the local RF environment. Tetley Replay is powerful and flexible but also easy to operate. Users power the unit on and the Web-based GUI makes it simple to configure and initiate record and playback modes, view signal activity in the environment in real time or view the contents of recorded spectrum. Tetley Replay supports local control via a tablet and can be remotely controlled from anywhere in the world.