ETSI EN 303 316 Broadband Direct Air-to-Ground Communications; Equipment operating in the 1 900 MHz to 1 920 MHz and 5 855 MHz to 5 875 MHz frequency bands; Beamforming antennas; Harmonised Standard covering the essential requirements of article 3.2 of Directive 2014/53/EU

standard by European Telecommunications Standards Institute, 04/01/2018