The main group of Digital Tv Transmitters is to the West. It is best to put a Terk HDTVi , (not the HDTVa) antenna in a window that is to the west aimed at about 264 degree magnetic compass direction.
Here is how to aim indoor antennas and outdoor antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
The building structure that has the least amount of reduction and blockage of indoor antenna reception is , wood with wood or vinyl siding and composition shingle roof.
Here is a - non complete - list of situations that will have more reduction or blockage of reception.
Metal siding , metal roof , solar panels , metal backed insulation , concrete walls , concrete blocks , brick walls , big rocks for walls , etc..
As always trees and trees leaves do a real fine job of reducing or blocking reception and so do buildings and other obstructions including the apartment building.
It is best to install a antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including the apartment building.
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.
________
Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.tigerdirect.com.
____________
Walmart has the simple RCA DTA800B1 digital converter box , the output is the legacy standard Definition 480i analog to the Tv.
The DTA800B1 is updated from earlier boxes and easier to use.
________
Here are boxes that have High Definition and more.
http://www.epvision.com.
http://www.channelmasterstore.com.
______________________
Getting closer to the truth , is a big help each day.