Definition
The band of radio frequencies from 30 megahertz (MHz) to 300 MHz. In aviation, VHF is used for most short-range air-to-ground voice communication and for navigation aids such as VOR and ILS localizers. VHF signals travel in essentially straight lines (line-of-sight), so range depends on altitude and terrain rather than atmospheric bouncing.
Plain English
A specific band of radio frequencies used for talking to controllers and for many navigation signals. The signals travel in straight lines, so the higher you fly, the further you can reach.
Context Anchor
Seen when selecting aircraft radio frequencies, using communication radios, and discussing certain navigation receivers.
Derivation
From Latin altus (high) by way of "high frequency," with "very" added to mark the band that sits above the older High Frequency (HF) band. The naming is a simple ladder: HF, then VHF, then UHF (Ultra-High Frequency) as engineers moved into higher and higher parts of the radio spectrum.
Why Pilots Care
Provides reliable line-of-sight voice contact with controllers and nearby aircraft without interference from distant stations.
Intuition Check
Very-high frequency does not mean any radio frequency that seems high. Here it means a defined radio band: 30 to 300 MHz.
Example Sentence 1
The pilot tuned the VHF radio to 121.5 MHz, the international emergency frequency.
Example Sentence 2
Very-high frequency radios give clear communications within line of sight of the ground station.