The have no SMA Plug on and the loss must be insane.
Most such devices use "F" connectors which have quite reasonable specs.
If you mean loss in the device, well, of course, that is the price you pay for wide bandwidth devices.
It won't be that high, though, as otherwise they would be useless for their intended purposes.
Not everybody lives in "line of sight" of their main metropolitan TV sites as I do, so they must be useable
at considerably lower signal levels to be any good elsewhere.
( I have two 2 way splitters feeding three TV outlets----one direct from the first splitter, & the other two from the second splitter which itself is fed from the second output of the first one.)