Very High Frequency, referring to radio waves in the 30-300 MHz range used for FM radio, television, and aviation communication.
Acronym formed in the mid-20th century from 'Very High Frequency'. The term emerged during World War II as radio technology advanced and the electromagnetic spectrum was systematically categorized for military and civilian use.
VHF waves have a fascinating property called 'line of sight' propagation - they travel in straight lines and can't bend around the Earth's curvature, which is why FM radio stations have limited range but crystal-clear sound quality. This is also why airplane pilots use VHF for communication, as it works perfectly for relatively short-distance, high-clarity transmissions.
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