This is the one I have. The signal strength on a 1 to 10 scale is an average of 7 on all the other channels that I do get and no signal at all on 11 and 13.
Like so many "amplified" antennas, the gain listed is about 75% [or more] from the amp, and not the antenna itself.
The size is limiting its "low end". The blade measures over a foot in each direction, so the internal elements are longer than in "that antenna".
Your "1 to 10", would be what my TV shows as 0-100, but it also shows signal to noise [ratio] in dB, which were the numbers in the article.
"Figure" noise is the constant, so signal to noise ratio is a sign of how much gain the antenna has.
Amps are good for cable loss from the antenna to the TV, but if the signal doesn't get picked up by the antenna itself, you can't amplify it and "magically" get it, since the signal and the noise both get amplified.