If you are referring to a cable signal on your tv set, then there are several ways, but first off, how do you know the signal is weak? Analog cable signals typically run at 30 to 40 percent while HD signals on the same line can be as high as 90%.
If your cable connections are firm and have no fray with good cable runs, and is not longer than needed, I would suggest calling the cable company tech support line for troubleshooting. It could be their error in an outside line.
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