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Ralph Mowery

In article , says...

Splitters really have very good isolation. They are pretty much
one way items. A signal into one of the 'outputs' only comes out
the 'input'. There shouldn't be any problem there. The real
problem with the OPs plan is that there would probably be
interference between the cables RF frequencies and the TV
RF frequencies.

Most splitters are simple resistor networks. They have very little
isolation. If you backfeed a 2 way splitter with a signal, it will pass
through with about 3 db less signal if it is a 2 way splitter. About the
same as a signal going through in the normal way.
One of the parameters is to keep the inpedance the same, not signal
isolation as the normal use is one way, not 2 way.