Best Way to Extend Home Network With No New Wires
Actiontec Ethernet to Coax Adapter Kit
Have you ever tried to stream an HD show from one TiVo or DVR to another and when you try to view it, it tells you to wait till enough of the file transfers? Does the Wifi signal from your router stop short of reaching your whole house? Well, you could always run more ethernet cables through the walls of your house or you can buy this pair. It uses your existing cable TV wire to transmit your home network from your router to ANY room in your home. Now, enjoy crazy fast, wired (NOT Wifi) networking without running a single new wire. I use it with a 5 port network switch (splitter) at one end so I can wire up the Tivo, Sonos, PS3 and AppleTV directly to my network on the other side of my house. It works at the same speed as if the devices were attached directly to your router. At $120, it's not inexpensive but compare than to the electrician's bill to run actual networking wire.
Using your cable wire is FAR superior to use of your home electric system - which is another common option.
Buy it on Amazon with this link: Actiontec Ethernet to Coax Adapter Kit