If you already have coaxial cables in your home you can easily use it to build your home LAN. The Ethernet-Over-Coax TVnet/C Pro adapter will halp you to do that. It ‘s compatible with Windows, Mac, and Linux-based computers. The system used it is truly plug-and-play: after connecting a TVnet adapter to the video or broadband source, all coax jacks throughout a home become network-enabled.
YOu can buy The Ethernet-Over-Coax TVnet/C Pro adapter on Smarthome site for $199.99.