The frequency band that a radio can operate within is called VHF (very high frequency), or UHF [ultra high frequency]. VHF operates between 136 and 174 MHz, while UHF operates between 400 and 512 MHz. Wave length is shorter the higher frequency. A signal will travel farther if it has a longer wave length. It is easier for the signal's to penetrate if the wave length is shorter. VHF broadcasts better over open water and from an unobstructed location to another. For broadcasting through buildings or other obstructions, UHF is better than VHF.