In reply to wercat:
I didn't mean to sound 'officious' or negative!
Amateurs use 144mhz for lots of things and 145.200 - 145.5935 for voice (VHF)
and also 430.0 - 431.0mhz (uhf) for voice.
Both frequencies are commonly used as handies (hand held radios ) And max pwr of 10w. Retailers selling these will normally ask for your callsign when buying one, but the're really not 'better' in terms of range or anything than the PMR ones.
As you say at these frequencies everything is normally line of sight -regardless of power.
The old CB frequency was 27mhz and the frequencies up to to much higher frequencies were capable in good propagation conditions of turning up some exceptional long distance communications, if some what irregularly. This is why, sometimes when there's high pressure you can sometimes hear 'foreign stations when listening to local or national radio on 88mhz!