The purpose of the loop is to provide a place to splice for a cable box, satellite receiver or whatever else you have that needs to put a signal on the coax. The problem is knowing which of the dual coax plugs at each base of the loop is the input or the output. Use an RG6 cable to connect from the input of the cable box (cable) to one of the coax connections, then use another RG6 cable to connect the output (TV) of the cable box to connect to the other coax cable. If you get no picture, swap them. When you find it works, label the coax jacks so you'll know in the future.
I used 6' RG6 cables for the connections. In my rig the "jumper" was too short and it was not RG6 so I don't even use it. I have since removed it and left the cables in place with quick connect adapters and connect them together with a barrel adapter so that the loop is just a lot longer, but easier to tap into for next time.
There should already be an external coax adapter to allow you to run a coax wire to a cable service, but this has be be provided by the campground. The purpose of the cable box is to decode any scrambled signals. Many of us use this external adapter for the coax from our satellite dish, then using the loop, we connect the satellite receiver which decodes the incoming satellite signals so we can watch them.
I hope this helps. If you are still confused, do NOT hesitate to ask more questions. This can be tricky to understand but once you do, it will make lots of sense and help you debug things when a problem occurs.
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