If the apartment building is . wood with wood or vinyl siding , no metal roof , and no metal backed insulation then install a TERK HDTVa antenna aimed at about 220 degree magnetic compass direction.
Here is how to aim indoor type antennas.
http://www.kyes.com/antenna/pointing/pointing.html.
The follow is a incomplete list of building construction that will reduce or block broadcast tv reception.
If the building is , concrete , concrete block , concrete roof tiles , bricks from ground to roof , big rocks for walls , metal siding , metal roof , metal backed insulation , solar panels .
Better reception will happen with the antenna in a south west facing window.
Is there a patio to the , west , south west , south??
As always , trees and tree leaves will reduce or block Tv reception and so do buildings and other obstructions.
It is best to install the antenna at a location that has the least amount to no amount of obstructions of any type or kind in the direction of reception.
The Tv/s Must Channel Scan for the Digital Broadcast Tv Channels , sometimes named the 'Air Channels' or 'Antenna Channels' in the Tv setup menu because the Tv transmissions travel through the air from the transmitting antenna to the receiving antenna.
DO NOT channel scan for cable tv channels.