It seems that you want to know how the Slingbox works.
When you use a Slingbox, you are sending the TV signal out to the Internet. You need to install it at home and connect it to your router and cable box or DVR. Then, you must run the Setup Assistant for Internet Viewing in order to allow the connection from remote locations. So, as you can notice, you will not need a TV set at all. In all case, I recommend you check the following article in order to get all the details:
Hope this helps!