Here's a modification that allows the IC-92AD to TX from 137-174MHz VHF and 420-470MHz UHF.
Please note that I am NOT the author of this mod, and therefore, cannot be held responsible for any damage caused while performing the modification.
In simple terms - YOU DO THIS MOD AT YOUR OWN RISK!
That said, the author claims that he has done the mod, and has had NO PROBLEMS!
Enjoy 'freebanding' responsibly (is that a contradiction in terms)?