I would not add a splitter after another splitter. doing that will lower the signal strength inside your house and could result in poor picture on analoge cable as well as longer loading times for digital cable and poor cable modem preformance if you use a cable modem downstream from 2 splitters. the best thing to do is change out the splitter outside to one with enough outputs for your needs and run a new cable to the new cable outlet. a 4 port amp would be good to if you have less than a great picture now. what ever you do don't buy cheap splitters, the cheap ones don't often alow the full range of frequencies used by cable internet and digital cable or alow the return signal those services use to pass thru freely. always buy the better stuff when it comes to this, it may cost more but if you go cheap and all the sudden your cable modem is not working one service call from comcast or any cable company will cost you more than buying good equipment. also using terminators on the outputs on splitters and wall jacks that nothing is connected to is a good idea, it stops RF leakage.

along with wayne's post, RG6 is a shielded cable which means it has a metallic shield inside the insulation the entire length of the cable. In a cable TV situation (as in outside supplied), there should be a grounding block where the cable from the provider is attached. There will be a grounding wire from that block to attach to your household grounding electrode system. The shielding prevents unwanted interference from elecromagnetic fields. If you are speaking of inside the home, the connector of the cable contacts that same shield and it is attached to whatever device it is attached to and is effectively grounded through that pathway.

Do you use it frequently? We use ours daily. We wake up to the news and I come home for lunch M-F and tune into shows during that time. We also watch TV at night, especially before bed. Do you spend the big bucks on cable for the TV and not watch it very often? Yes, and I feel ripped off with Directv. Also do you fight over it with your SO? No. We have multiple TVs so if we disagree on a show then I just watch in a different room. Our house isn't that big and it's just me and the hubby. We have a 54" in our living room and I don't consider that very big anymore. When we replace it someday we'll go to 65-70". Our living room is open to the kitchen and I have to squint to see the guide on my 54" so bigger is needed lol. In our bedroom I think we have a 46" ?? It's not very far from our bed so it's plenty big. And in the basement we have around a 50" but we never go down there. Our TVs are older but get the job done. It's so hard for me to spend money on an item when I have something that already works. So I just wait until things break. I'm down to my last working HDMI port on the living room TV so once that one goes then I'll cheerfully buy a new 65-70"...

With the recessed shelf under the TV, it seems like your TV will be mounted very high. I would buy a freestanding media console and put it on the wall where your wife wants to put the box. Mount the TV on that wall above the media console on a full swivel motion mount. You can pull it out and angle in the room when you're watching TV. The TV can also be mounted at a more appropriate height for comfortable viewing.