Current setup is cable TV and Internet run through a cable company provided three-way splitter (5 Mhz -1003 Mhz) TV at each endpoint, modem at one. Works fine since the cable company put in new line.

While planning my coax and ethernet runs, I have been doing research here on the forums and elsewhere on the interwebs, but I am actually more confused about how to split my coax than before I started ...