You have many signals available to you. The challenge is that the transmitters are very close which results in too much signal strength. Use of 20 to 50 dB of attenuation may be needed.
You need to resist the temptation to use any sort of amplifier... external or built in to the antenna. Simply unplugging power from an amplifier is not enough, the amplifier must not be in the system at all. A Terk HDTVi (not the HDTVa) would be an option. You could also opt for an RCA ANT-751 possibly in the attic or outside... In any case you may need to add attenuation between the antenna and TV.
http://www.amazon.com/Terk-Technolog...rds=terk+hdtvi
http://www.amazon.com/RCA-ANT751R-Ou...ywords=ANT-751
http://www.smarthome.com/7800/Signal...en=14523830383