Ultrahigh frequencies (UHF) refer to the electromagnetic waves with frequencies between 300 MHz to 3 GHz. Synonyms for UHF include microwave frequencies, super high frequency (SHF), and gigahertz frequencies. Microwave frequencies are commonly used in communication technologies, radar, and satellite communications. SHF is a range between 3 to 30 GHz and can be used in radio astronomy and remote sensing applications. Gigahertz frequencies refer to the same range as UHF and are commonly used in mobile communication devices like smartphones and Wi-Fi routers. Despite the slight variation, all these synonyms refer to the same range of electromagnetic waves and their uses are virtually interchangeable.