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Oddly enough I get no channels without the Preamp?
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Not odd at all. That means all the signals coming off the antenna are too low a power level to make the trip from the antenna into the tuner without dropping below the tuner's sensitivity threshold. The amp boosts the levels to the point where they can make that trip without dropping too low.
Are you trying to look through trees or some other obstacle? Trees will have hugely varying amounts of attenuation and may render the signal calculations performed by the simulation software moot.