Go all the way to the antenna connection. Clean everything. Use a steel wool pad, or 600 grit, or something to clean everything at the antenna on the mast. Just replace the coax to the new pre-amp. Check the pre-amp is getting DC power from either the coax(in some cases) or the DC line to the pre-amp. I would just replace the coax from the pre-amp to the house. If you want to keep it, you'll need an O'scope to check the signal level at the output of the pre-amp and compare it to the output in the house. There's a certain amount of dB loss expected, but an O'scope or RF sensitive power meter is needed to check that. Better to just replace it.
Since both TVs were working fine before, you can sort of discount the wires FROM the splitter, bit go ahead and get a new splitter while you replace the coax. Or - you can try the splitter first, as it's the cheaper, and easier thing to swap, but more likely the outside cable. sorry.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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