The amateur 4 metre band is located just above 70 MHz.
The 4 metre band is available to amateurs in certain countries in Region 1, but is not available in the United States or Japan. This makes manufactured radio equipment for the band very rare. Most amateurs use homebrew or modified gear to operate on 4 metres.
Different countries have different 4 metre band edges, as shown in this band chart.
A good source of information is the Four Metres Website.