The antenna metal receiving elements need to be in the horizontal , not up right vertical. The television transmissions at your location are so strong that tuner over load can easly happen. all you need is a indoor antenna.
http://forum.tvfool.com/showthread.php?t=233 . Read and watch the video on double rescan at
http://www.dtv.gov This one also has strong signals
http://forum.tvfool.com/showthread.php?t=609 and the same advice applies to you.