Go to Tigerdirect.com or Newegg.com and order a Linksys wireless router, about $50. When comcast installs your cable, they will plug the internet cable into it. You will have to set it up, but follow the instructions, it is easy. And if you have any problems there help desk is really good. I recommend the Linksys as you have a more secure wireless network as someone needs a password that you select to get into it. I have a large designer home and I get signal everywhere, even out by the pool and the router is in the front den.
Here is the one I use as an example.
http://www.tigerdirect.com/applicati...2&sku=L48-2636