I want to now address your original concern about damage from overload:
THREE TYPES OF OVERLOAD
There are three types of preamp or tuner overload, in order of increasing signal strength:
1. The strong signals almost cause enough IM distortion to interfere with the reception of weak desired signals, but the spurious signals are at or below the noise floor. This is the point that holl_ands uses in his preamp charts to obtain max SFDR (Spurious Free Dynamic Range). No damage will happen.
As the strongest signals continue to increase in strength, more of the weaker signals are damaged until you reach:
2. The strong signals cause overload to the preamp or tuner that makes it impossible to receive any signals. No damage will happen. The strongest signals are still there, but they can't be decoded because the IMD products have damaged them so that they contain more errors (high BER....bit error ratio/rate) than be corrected by the FEC (forward error correction).
3. The signals are so strong that the input transistor is toast. You are not likely to encounter OTA signals that strong, unless you live next door to a high power transmitter and you have your high gain antenna aimed at the transmitter's antenna.
As a general rule, tuners can tolerate stronger signals than preamps before overload. The difference in strength is approx. equal to the preamp gain.
You will find the preamp chart by holl_ands here:
http://imageevent.com/holl_ands/files/ota
Scroll down to Modified solid signal Chart Comparing Preamps - RevB
It doesn't list all amps, but it gives you the general idea.
He also has a DTV Preamp Signal Overload Calculator - Rev M that calculates Max Input Signal to Maximize SFDR (Spurious Free Dynamic Range).
There is also a system noise figure chart.