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For a single antenna application, you don't need the signal mixing that the preamp provides. You may not need the preamp, if your cable run is fairly short. If you have long cables to drive, the preamp will help by boosting the amplitude (not the quality) of the signal from the antenna.
The flip side of this is if you have strong signals to begin with, the signal can overload the preamp or tuner ... but I expect with your reception plot you won't run into that. Up to you - probably won't hurt, might help.
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