This recommendation is based on the tvfool radar plot for Current Plus Pending Applications Included Digital Broadcast Tv Channels.
Install a Terk HDTVi , Non Amplified indoor antenna. Do Not use any type or kind of amplified antenna , the Tv transmissions are VERY STRONG at your location , a amplifier will overload and be the cause of bad reception or no reception of some channels.
Aim the HDTVi antenna at about 340 degree magnetic compass. Here is how to aim indoor and outdoor type antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
The best building structure for indoor Tv reception is , wood frame with wood or vinyl siding and standard asphalt type composition flat shingles on the roof.
If the building is/has , metal framing , concrete walls , concrete blocks , cinder blocks , bricks from ground to roof , big rocks for walls , Metal siding , stucko Wire , metal roof , metal backed insulation , solar panels , then reception will be reduced or blocked.
Does your apartment have a patio or balcony on the , north , east , south or west side??
Is your apartment a end unit ??
And you say the only windows are east facing windows??
Is the apartment a basement apartment??
Is the apartment a ground floor apartment??
If not , what floor?? How many floors does the building have??
Is yours the top floor??
Here are places to by the HDTVi ,
http://www.solidsignal.com ,
http://www.amazon.com.