Geopla, welcome to the forum a we hope you enjoy your stay here. When you say wireless you don't have a cable going to it at all and you pick comcast out of the air (WIFI)?
Edit:
Features of Comcast Wireless Home Networking
* Multiple Computers: If you have multiple computers, and only one connection, Comcast makes it easy. Up to five computers can be connected to the Internet at once without incurring any additional charges.
* Wireless Capabilities: Enjoy Internet access in every room and even outside within 150 feet of the gateway with Comcast wireless home networking.
* Faster Speeds: The standard Comcast package gives you speeds of up to 4 Mbps downstream and 384 Kbps upstream. For an extra $10 per month, you get up to 6 Mbps downstream and 768 Kbps upstream. No more waiting around for pages to load or information to send.
* Security Features: Everyone can enjoy Comcast