The ultra high frequency band of radio waves in electromagnetic wave is used as in

The Ultra-high frequency (UHF) is the International Telecommunication Union agency given name for radio frequencies who lie between 300 MHz and 3 GHz.
The Ultra-high frequency band is used for satellite communication as well as cellular phone communications because the frequency in the range is high and the band is wide with a span of 2.7 GHz from the low end to high end which makes the wideband modulation and spread spectrum modes practical. It is of the order 10⁹ Hz.