The International Telecommunications Union (ITU) held its latest World Radio Conference (WRC-19) in Egypt over the past few weeks, providing a new set of rules to achieve global or regional harmonization in key 5G spectrum bands. Agreements signed by 3,400 delegates from 165 states were enshrined in an international treaty on radio and satellite operations, the Final Acts of the Radio Regulations. Although the previous meeting, WRC-15, had listed a set of candidate bands in millimeter wave spectrum for further study, 2019 was the year when mmWave became part of the international treaty, rather than just subject to country-specific regulatory decisions. The high bands identified as international mobile spectrum were 24.25-27.5 GHz, 37-43.5 GHz, 45.5-47 GHz, 47.2-48.2 and 66-71 GHz. This omits the…