Wired internet connection via Coax cable

I have recently removed a 1TB TiVo box and connected in its place a 360 Box to allow viewing on a second TV in a different part of the house to the Hub 3. There isn't a separate ethernet cable from the Hub 3 to the second TV position. This old TiVo box was, and the new 360 Box is, connected using a separate Virgin installed Coax Cable. Is it possible to determine if there is a broadband/internet signal being provided down this second coax cable that could be utilised using a signal splitter?