I don't know about sending a raw cable signal, but I would not recommend one of those "wireless video senders" if you have wifi or any other 2.4ghz devices. I have a radio shack one that works ok, but ...
Add Yahoo as a preferred source to see more of our stories on Google. Before you attempt to mirror to a TV, be sure the TV and the laptop are connected to the same network. Can't go wireless? Connect ...