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How to conceal wiring behind drywall 
Start by mounting your television and television mount to the wall. 
After doing so you will be able to remove the television and leave the mount on the wall. This will allow you to select a good spot to make a hole in the wall.
Choose from:
[1]. Cut two holes in the drywall, one near the television and one near the a/v receiver or other audio video equipment. Make sure to use a stud finder to determine the position of the hole will be between two studs (with at least 1 " of clearance on each side of the hole)..
[2]. Make sure that you, especially if working alone or have friends who are not looking, are able to see your basement. Cover walls wherever possible with plastic sheeting..
[3]. You can even install small tiles to make the hole, if you have them available. Purchase a grounding platform for your mounted tv..
[4]. Locate the drill for the drill that will fit into the drywall but do not use a drill for drywall you will not be hanging the drywall. With most hardware, there is just enough room to fit in and install the drywall..
[1].