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That's not a published specification that I've ever seen.
The design of the tuner front-end would govern. If diode protected, voltage in excess of its forward bias voltage would result in the protection diode going into conduction, thereby limiting the peak voltage that can be seen by subsequent components in the tuner. The typical silicon diode has a Vf rating of 0.7V. Damage would occur if the current in the protection diode exceeded it's capability. If it failed in a short circuit condition, the rest of the tuner may survive, but with a short circuited input. If it failed open, then you would expect additional components to fail in the tuner.
To put some numbers around this, in a 75Ω system, a signal level of +6 dBm will have a voltage of about 0.773Vpeak or 0.546Vrms. This represents power of 4/1000 of a Watt.
I don't see how typical signal levels and antenna gain would be able to put a tuner at risk of damage.
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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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