Instruction: Answer the given question using the supporting document.

Input:
Question: Can I use this off the coaxial wall connector inside my house (where it goes from wall to TV)?  Or does it have to be installed outside?
Document: It says in the instructions that it should be inside an enclosure when outside - I have no good way to do this so it is in open air, though the connections are insulated - comcast must have used an insulated connection of some sort when hooking everything in.I also installed a whole house surge protector from eaton (listed cutler hammer on amazon) - as I don't have phone service these two items together protect the whole house. Good investment I think.
So far I "like" it. The TII 212 Broadband Cable TV Lightning Surge Protector was easy to install. I unscrewed the ground wire from the ground block, unscrewed the two screws holding the grounding block to the CBS outside wall, and unscrewed the "service" and "customer" cable F-connectors from the ground block.
I can only comment on the thru performance. Can't comment on the surge protection part and hope to never have to. I installed this device outside where my house receives the signal. It is located in a weather resistant box. My grounding rod is about 2 feet away from the cable box itself. Grounding this using was so easy, instructions don't even need to be given.
Received this product and it didn't have any instructions. I assumed all I had to do was plug the cable from the pole in somewhere before it splits to the rest of the house. Didn't notice anywhere outside I could easily attach it, so I put it in the basement before the powered splitter the cable company installed. Keep in mind you will need a short jumper or new cable ends where you put this in.
Works fine with Comcast internet and cable tv. Installed it outside on the main line before any splitters and ran 8 awg ground wire to house ground. Hopefully it works as advertised.
This was easy to install and I used it to replace a plain grounding block at the cable TV service entrance to my house. HD channel quality actually improved--could be because I also installed new F-connectors on the ends of the cables at the time of installation.
Kinda hard to review something that either works or goes ka-plooie.It looks good, was pretty easy to install, and my cable TV and internet seem to be working fine.I installed it in the service box like the picture that SXEblue posted.The reason I got this was that I had a power surge suppressor strip with a cable filter built in.One day I found my modem not working, and eventually realized that the filter had tripped. I guess it saved my modem.
I have had four of these in place for almost four years. They are mounted to the inside grounding plate that I have where the cables enter the building. The grounding plate is connected with copper strap to outside ground rods, the copper plumbing, service panel, and other grounds. When you mount these, think short, straight, path to the best ground that you have. Square corners on ground wire may look pretty, but add inductance. Normal grounding blocks bond the cable shield to the ground system.
Put this on my incoming comcast line - no issues with TV and no drop in internet speed. Comcast already had a grounded connector on the line - was a real tiny thing that provided a ground to the line but nothing else, I am assuming it is there partly to give them an easy place to connect/disconnect the service. This went in its place with no issue.
Nice, well made device. All specifications appear to be good. Fortunately I have not had a lightning strike.As an installation note. I installed a ground rod connected the ground wire and spliced in the surge suppressor, went inside to find that I had no signal. After reading a couple of different on-line descriptions and installation instructions, I finally came across a note stating the surge suppressor is directional.
Answer: it should be used outside at the point of connection to your home from the cable service.  it also needs to be properly grounded to your electrical system to be funcitional.  the cable company will have grounded their initial attachment, remove that ground and connect it to this device.  make sure you have the cable feed from the company connected at the end that (i believe from memory) says "service", the other end will say something like "customer", that's where you connect the line that goes into the house.  i also recommend securing this to the house structure via the mounting holes provided.  make up your connections wrench tight to help prevent oxidation of the copper center which carries the signal.  best of luck to you.  remember, connect it outside at the point of attachment and ground it.