Commercial drones that use traditional RF (radio frequency) datalinks typically use the 2.4 GHz or 5.8 GHz frequencies, which are part of the unlicensed ISM (industrial, medical and scientific) portions of the RF spectrum. Some drones may use lower frequencies such as those in the in the 900 MHz band, but these frequencies are not suited for transmission of high-definition video and are usually used for hobby and amateur applications.
UAVs that use cellular communications typically use either 4G or 5G connectivity. 4G uses a range of frequencies below 6 GHz, while 5G uses a number of frequency ranges across the spectrum.