Some splitters are power passing and some splitters do not pass power.
The power from the , preamp power supply/power injector , must be able to get to the preamp unit.
Aim the antenna at about 352 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html/.
As always , the strating antenna aim direction --> is the starting antenna aim direction.
The antenna aim direction can adjusted for best reception.
Most Digital Tv's have a signal strength meter and some Digital Tv's also have a signal quality meter.
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Here are web sites that provide information you are looking for.
http://www.epvision.com.
http://www.channelmasterstore.com.
http://www.sewelldirect.com.
http://www.ramelectronics.net.