The R&S PR100 portable receiver has been specifically designed for radio monitoring applications in the field. The receiver's functions and control concept have been optimized for monitoring tasks. In addition, it can be used for a variety of other applications. The R&S PR100 operates in a wide frequency range from 9kHz to 7.5GHz. Whether used for monitoring emissions, detecting interference or locating miniature transmitters, the receiver always combines high mobility with maximum operating ease. The receiver and the R&S HE300 active directional antenna together form a compact receiving system. The receiver can also be used in conjunction with other antennas, e.g. broadband omnidirectional antennas.