It is likely that, assuming you have one, your cable modem already is a WiFi hot spot for you, all your neighbors and anyone passing by
http://money.cnn.com/2014/06/16/technology/security/comcast-wifi-hotspot/index.html
But I'm not sure I understand what you are trying to connect.
The way the wireless Router works is ...
Modem => Router => Desktops Via Ethernet
Modem => Router => Wireless to all your portable devices (laptops, phones, tablets, phablets, etc)
Modem => Router => Wireless to all "guests" portable devices (laptops, phones, tablets, phablets, etc)
What else do you want to connect ?