You did good on antenna selection. Aim the antenna at about 159 degree magnetic compass. Here is how to aim indoor Tv antennas ,
http://www.kyes.com/antenna/pointing/pointing.html . A apt. building that has wood frame construction with wood or vinyl siding and a composition shingle roof is good for Tv reception. These next construction materials can reduce or block Tv reception , concrete , bricks , stucko Wire , metal siding , metal roof , solar panels , metal backed insulation , Texas , for some reason is real big on metal backed insulation. Is your apt. building lined with metal backed insulation in the walls or inside of the roof?? . Saying that you can not put a antenna out side is not true , do you have a patio or balcony?? And in what direction is the patio or balcony?? Here is the Federal Law that says Yes you can put a Tv antenna on the patio or balcony ,
http://www.fcc.gov/mb/facts/otard.html . This -> Federal Law <- Overrides All other laws , HOA's , housing covents , apartment housing rules and regulations.