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go to say Radio Shack and purchace some Multi cored, (4 -6 core) Co-axial cable, this means you have 4 - 6 "Conductors" and use the shield for all the earths & negative power,. This will give you what you need. At a pinch, you could always get a single core, audio coax, and run 4 of them and tape, or zippy tie, into a bundle.
This is the best solution for your problem as a 40 year experience with wires etc.
Go to the source of your cable signal connector .
Open it and clean the terminals with emery paper , sand the end of the cable shiny clean from corrosion , get a new barrel connectors with gold terminals if possible lengthen the ends of the cable , insert and tighten good, use thick rg-16 or rg 40 cable with good insulation ends crimped professionally with a crimpier or buy ready made , not from dollar store. Get a gold plated professional splitter if you need one or two , it will cost about 15 or more each . Make the cable runs as short as possible, using the thick good cables. If needed get a signal magnifier. From radio shack or the source etc. Connect them good and tight . Ground the splitters . Problem solved , you will get crystal clear channel 2 to 7 including 3 and 4 . Isolate the TV cable from other cables and power wires.
There is a possibility that you have a weak video signal. You can boost this with a small video amplifier. This is most commonly seen in set-ups that have multiple monitors or when you have long video cable runs like you would see in an RV back-up camera system.