CISPR 16-1-5:2014 specifies the requirements for calibration sites in the frequency range 5 MHz to 18 GHz used to perform antenna calibrations according to CISPR 16-1-6. It also specifies the requirements for reference test sites that are used for the validation of compliance test sites in the frequency range 30 MHz to 1 000 MHz according to CISPR 16-1-4. It has the status of a basic EMC standard in accordance with IEC Guide 107. Measurement instrumentation specifications are given in CISPR 16-1-1 and CISPR 16-1-4. Further information and background on uncertainties in general is given in CISPR 16-4, which can also be helpful in establishing uncertainty estimates for the calibration processes of antennas and site validation measurements. This second edition cancels and replaces the first edition published in 2003, and its Amendment 1 (2012). It constitutes a technical revision which includes the following significant technical changes with respect to the previous edition: - site validation methods for other sites covered in CISPR 16-1-6 are added; - smaller step sizes are specified for swept frequency measurements; - the minimum ground plane size is increased; - and other miscellaneous technical and editorial refinements are included. Keywords: electromagnetic compatibility The contents of the corrigendum 1 of August 2020 have been included in this copy.