Which frequency band is NOT typically used by SATCOM?

The correct choice, VHF, is not typically used by SATCOM (Satellite Communication) systems primarily because of the unique requirements of satellite communication which favor higher frequency bands.

VHF, or Very High Frequency, operates in the range of 30 MHz to 300 MHz, which can suffer from significant atmospheric interference and has limited bandwidth capabilities. This makes it less suitable for the high capacity, long-distance communication typically required by satellite systems.

In contrast, the other frequency bands mentioned—SHF (Super High Frequency), UHF (Ultra High Frequency), and EHF (Extremely High Frequency)—are commonly employed in satellite communication. SHF and UHF are particularly popular for their ability to handle various types of communication, including television broadcasting, mobile communications, and military applications. EHF, while less common, is utilized for specialized military and secure communications due to its high data capacity and resistance to jamming.

Given the technological demands and operational characteristics of SATCOM, VHF's constraints make it an unsuitable choice for these applications.