lowband

Lowband refers to the lowest portion of the radio frequency spectrum, typically considered to be from 30 MHz to 300 MHz. This frequency range is characterized by its ability to travel long distances and penetrate obstacles like buildings and foliage relatively well. This makes lowband frequencies valuable for various applications, including land mobile radio systems used by public safety and commercial organizations. These systems often utilize lowband because of its reliable coverage over wide areas.

The propagation characteristics of lowband are influenced by factors such as the Earth's curvature and atmospheric conditions. While excellent for ground wave propagation, it is less susceptible to ionospheric reflection compared to higher frequencies. This means that long-distance communication at lowband relies more on the direct path between transmitters and receivers. However, this can also lead to increased susceptibility to certain types of interference.

In addition to land mobile radio, lowband frequencies have been used for broadcast radio (specifically AM radio, though the term "lowband" typically refers to VHF frequencies), and some forms of amateur radio communication. The allocation and use of lowband spectrum are managed by regulatory bodies to ensure efficient and interference-free operation. Due to its desirable propagation properties, lowband spectrum is a finite resource and is carefully allocated for specific services.