Not only will a lot of amateur gear go into 500Mhz, but I have some
commercial two-way radios (Kenwood TK-840) that are legal for operation
there as sold. Programmed with pc software.

I need a radio that can TX on 2m with general RX on 500 mhz. I have yet to find
one amateur radio that can do that. The dualbanders all seem to have a top RX
range of around 470 mhz and I haven't found a 2m monoband radio that can RX
outside of VHF.
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73! de Andy KC2SSB - WPYI880 (GMRS)
Beachwood, NJ USA! Grid FM29vw
http://vhfradiobuff.tripod.com