Peter, 2.4 gigahertz seems to be emerging as a good alternative and it is legal both here and in the US. If you want to keep costs down you can use 27 MHz which is the only other band that is legal for ground model control both here and in the US. None of ants (fairyweights as the Americans call them)currently registered for the 2007 Robolympics is using 27 MHz - you would have the band to yourself.