Hi i will have a up/down converter ready soon from 5ghz to 10 ghz.
and i have a custom build combiner /diplexer for 4 diffrent transmitters to one antenna! this is for the 5-6 ghz band. the chanel separation is around 26-30 db. so i hope it will work.
Since you seem to the ability, could you do a converter from the 5gh bands to uhf channels below 746mhz? I have a good market if the price is cheap enough to use in CPE's.