Longwave radio refers to radio frequencies in the range of 30 kHz to 300 kHz. These low-frequency waves can travel long distances, often beyond the horizon, making them suitable for broadcasting over large areas. Longwave signals can penetrate through obstacles like buildings and trees, which helps in maintaining clear communication even in challenging environments. Longwave radio is commonly used for maritime and aeronautical communication, as well as for broadcasting in some countries. Notable examples include BBC Radio 4 in the UK, which transmits on longwave frequencies, providing reliable news and entertainment to listeners across vast regions.