If this is what you want to do, I think it would work:
Code:
coax 100ft > TV
/
42XG > coax 10ft > grounding > 3410 > splitter > coax 50ft > TV
block \ /
splitter >
\
coax 50ft > TV
The 3412 contains a splitter inside the case, so a 3412 plus one splitter gives the same result as a 3410 and two splitters.