I agree that most preamp that is used in a OTA system is a overkill, too much gain most people think more is better.
I do not recommend a preamp unless you are going to run more than 70' and intending to split the signal. I have been using at my office a Winegard AP4700 and going directly into the tv from a 4221 is fine.
This would be a better choice for those who need a milder boost becuase of cable or split signal loss.
I mean you really only need a preamp if you have long cable runs or intend to split the signal several times.
I know with my short cable runs less than 50' from my antenna that with my 7775 I have to reduce the signal going into all my tuners.
I have the premp in my bedroom and use a 3 way splitter 7db port to the LG with a 3db attenuator. if not I noticed Cbc pixelates at times.
Going into my Dish 811 receiver its down -25db if not Pbs would pilexate. Out of the other 7db port then into a 8, then 6 then 3 db attenuators.
The Samsung 451 rec wuld normally get 7db but had to add a 3db attenuator total 10.5db I found that Fox would pixelate at 7db.
The Jvc tuner in the tv is fine with output down 7db in total because of the way I distributed the signal. No problems with the signal there.