Radiofrequency spectrum is the fuel of all wireless communications. Depending on geography, regulators allocate 5G spectrum into two to three broad ranges: high-band spectrum (e.g. millimeter-wave), which supports the fastest 5G speeds; mid-band spectrum or sub-6 gigahertz (e.g. 1-6 gigahertz), which offers a good mix of coverage and capacity; and low-band spectrum (e.g. below 1 gigahertz), which provides strong wide-area and in-building coverage.