First , read and understand this ,
http://forum.tvfool.com/showthread.php?t=695 . Next , the group of transmitters are to the south and a little west. Do you have any windows or front patio or rear patio that is more or less in the direction the direction of the group of transmitters to the south and a little west. Also for indoor antennas read and understand this
http://forum.tvfool.com/showthread.php?t=233