As you contemplate whether to install an antenna or not, I can offer that it's reasonable to expect reliable reception of signals with NM values as low as 0.0 dB. This is based on the performance of a Winegard HD7698P, an Antennas Direct CPA-19 preamp and mounting clear of obstructions such as trees and buildings. Weaker signals between 0.0 and -10 dB NM can also be received but as they get weaker, you should expect pixelization and or loss of signal to be more and more likely.
So, if you want to run another report at a practical level, you should have a 'ballpark' estimate to work with.
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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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