Tv Reception is Strong Signal Strength at your location.
Do Not use any type or kind of separate or built in amplifier.
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Your building construction and buildings that are in the direction of reception will reduce and block reception.
The aim direction for antenna is about 215 degree magnetic compass direction.
Here is how to aim indoor type and outdoor type antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Old School magnetic compass.
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Install a Terk HDTVi (not HDTVa) antenna in/at a ,
-->South West facing , window , patio window glass , as a first choice.
Or , West , South , as other directions.
If required due to locations of antenna and Tv , run a long coax from antenna to Tv.
Digital tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
Do Double Rescan ,
http://www.wchstv.com/DoubleRescanAlert.pdf.
Can also test reception with the ANT751 or HBU11 antennas , in/at , the South West facing or South or West , windows , patio.
Or better yet put a ANT751 or HBU11 antenna out on the pattio.
Here are places to buy antennas and etc. .
http://www.solidsignal.com.
http://www.amazon.com.
http://www.antennacraft.net.