AVS Special Member
Join Date: Nov 2006
Location: Bushnell's Basin, NY
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Before adding a dist amp, you have a few loose ends to attend to. The first is the unterminated feed out of the 4-way splitter. This causes reflections within your line, your own multi-path signal source, and that's how a 100% signal may not come in.
Next, see if all those splits is the problem. Each pair costs 3-4dB, and the quad is 6-8dB. Run a single, unsplit line to your closest TV and see if reception issues go away. If so, a distribution amp at the quad splitter location should take care of you.
But first, terminate those open lines!