The Z880 is a baseband video switcher and you cannot mix those signals on the cable with RF signals - so a seporate coax run is needed to each TV - and the TVs also need to have a composite video input.

The Z880 provides high quality baseband video distribution for up to 8 DVD or DSS video signals - ideally siuted for large (25" +) TVs located through out the house.

ELAN also sells a 3 channel digital modulator with +30dBmV outputs (no external amplifier needed)that allow you to take 3 composite video signals and sum them in with your cable TV signal - which should be more than sufficient for the Sony Mega Changer video output (as well as 2 other sources).