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You can splice as many wires as you want, it will not affect quality or nothing. The only draw back is trouble shooting, when stuff is "dasiy chain" wired if the feeder goes bad or whatever you lose all the jacks connected to it.. Compared if you home run each jack to a basment ultiltly room for easy access and trouble shooting purposes..
But the best way to splice in the attic would be schotloks made by 3M. Couple different ones are made but you want the red one for 3ways slices, they are waterproof and corrions proof..