It looks like mio's tuner is not quite sharp, on my box at least
according to mio tuner, there is no tp on my arc with a signal quality above 15db !!

checked the entire arc with a vu+zero and dm800se, and these 2 tuners can find better signal quality.
i can see picture on tv with these 2 boxes, where mio can't find any signal !
in general signal quality shown by these 2 boxes are always better then what mio is shown.
settings are the same on all 3 tuners.