You need to use a coax splitter and run a coax cable from the wall to your Slingbox. Run the other coax from the wall to your cable box. Then, you can use component cables from your cable box to your Slingbox. Then use component or HDMI or whatever you want from your cable box to your tv. Now, you can use your Slingbox to view tv coming from your cable box or tv coming from your Slingbox tv tuner. When someone else is watching tv at home, you need to watch from the Slingbox tuner if you want to watch a different channel or you can watch from the cable box if you want to watch the same channel.