While I certainly wouldn't suggest RG-59 in a new install, it can serve well in short to medium length cable runs. The difference in loss between RG-59 and RG-6 is not dramatic. Presuming there is no damage or corrosion, that it's in serviceable condition, it would be hard to justify replacing the cable.
Having said all that, if there is any possibility that the cable has failed in any way, swap it out for a good piece of RG-6. And as ADTech has pointed out, on average, the factors he cites are more likely to account for unreliable reception.
Getting water out of the ground, to a tap depends first on getting a hole dug in the right spot and deep enough. Pipes and pumps alone won't produce water. Reliable TV reception depends first on the antenna, it's location and aim.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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