My new tivo needs a internet connection. In its room is coax cable that is already sending comcast cable tv signal I know because its plugged into my digital tv and its already getting my cable channels. Some HD too. In another room I have my comcast modem and router for internet. Too far to wire ethernet to. I was trying to decide if I wanted the $65 tivo N wireless adapter or the $105 NETGEAR XAVB5001 Powerline AV 500 Adapter Kit when I suddenly wondered if there was a third option other than MOCA which uses coax to deliver internet but as I understand it cost even more. Can I instead split the coax cable in my tivo room- and send into tivo and the other into a $20 cable modem and ethernet out of modem into tivo? This wouild be the second comcast cable modem in my house and I wouldn't plan on hooking a pc up to it. Will this work? Good idea?