Is the building where the antenna is at wrapped with any type or kind of metal such as but not limited to metal siding or stucko with stucko Wire ?? Does the building have a metal roof ?? does the building have brick from ground to roof. Does the building have poured concrete walls ?? Read and understand this about indoor Tv antennas ,
http://forum.tvfool.com/showthread.php?t=233 , Here is how to point Tv antennas ,
http://www.kyes.com/antenna/pointing/pointing.html