Not quite part of the op question but the pass through is a good feature as I originally had run 2 seperate lines to each tuner like you would dvb-s which was causing me grief as I had an extra split and also no way to properly route the second feed (other than down the stairs)
I had issues with strength as well as I was effectively splitting 4 times
until I tried a loop through
I was shocked it worked but none the less happy as I had a good signal back and no new cable to try and route through a newly decorated part of the house!!

Oh I use a venton hd2 but I think it's just virtually the same box just rebadged