Theoretically, they add a level of protection. They should not cause a significant amount of loss.
Surge protectors incorporated into an outlet strip should not be the sole means of grounding. As the only grounding devise, they can be disconnected easily, leaving ungrounded coax throughout the premise.
It's best to ground the mast and coax before the antenna system enters the building. Adding a surge protector at the TV adds a bit more confidence that if a nearby lighting strike occurs, there are several paths to ground before the TV.
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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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