Regarding 56k+ on UHF it can be done, at east
commercially. I worked for
DataRadio ...
Lin N4YCI
Wow. Thanks for this info Lin!!! (Especially the part about the ability to
deal with multi-path at 80 MPH!)
It looks like DataRadio has been purchased by CalAmp, which now offers the
Gemini G3-UHF.
http://www.calamp.com/products/private-radios-narrow-band-equipment/private-
mobile-networks/gemini-g3-uhf
I just called and left a message requesting more info.
Michael
N6MEF