For convenience the radio frequencies are split up into areas called: M.F. (Medium Frequency), H.F. (High Frequencies), V.H.F. (Very High Frequency), U.H.F. (Ultra High Frequency) and Microwave. 

Ultra High Frequency:  From 300MHz to 3000Mhz (3GHz) "VERY Line Of Sight" (If you can see it you can talk to it!)  Very small antennas (a few inches), higher up is better Increasingly used for local communications with F.M. portable or mobile radios Long distance communications (including Moon Bounce are possible under some conditions. S.S.B. or C.W. (Morse Code) are often used under these circumstances. Packet Radio commonly uses modified F.M. radios at 1200 Baud and above for computer communications. In Canada, there are four bands available for Amateur Radio use in the U.H.F. area. The most commonly used is the 440MHz band (430MHz to 450MHz)