mmWave spectrum bands are being explicitly opened up to enable provision of 5G services. The 24.25–29.5 GHz range covering the overlapping bands n257 (26.5–29.5 GHz), n258 (24.25–27.5 GHz) and n261 (27.5–28.35 GHz) has been the most-licensed/deployed 5G mmWave spectrum range to date.