The Digital Tv transmissions are Very Strong Signal Strength at your location.
DO NOT use any type or kind of amplifier or antenna that has a amplifier , the amplifier Will Overload because of the strong Tv signals and be the cause of bad reception or no reception of some Digital Broadcast Tv stations/channels.
Strong signals mean strong reflected signals bouncing around (multipath) in the condo units.
Digital Broadcast Tv tuners Do Not like a overload of reflected Tv signals bouncing all around.
Use the Terk HDTVi no amplifier antenna , not the HDTVa amplified antenna.
Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com.
As you can see , looking at the tvfool radar plot map the most groups of Tv stations are to the , south west , south , south east.
For the best reception put the HDTVi antenna in/at a window or balcony door window that faces the South East direction or south west or south.
The South East Direction is the in between direction and will receive the most Digital Tv stations/channels.
Aim the HDTVi antenna at about 160 degree magnetic compass direction.
Here is how to aim indoor and outdoor antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
The building construction for the best reception with a indoor antenna is , wood with wood or vinyl siding.
The following is a - Non complete list - of building construction that Will Reflect , Reduce , Block , Digital Broadcast Tv Reception.
Concrete , concrete blocks , concrete tile roof , bricks , metal siding , metal roof , metal doors , metal beams , metal backed insulation , stucko Wire , solar panels , other buildings , and etc.
It is best to locate the antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception.
If the Tv and HDTVi antenna are far apart , then use a Looooong coax to connect the Tv and HDTVi antenna.
As always , The Tv Must Channel Scan for the Digital Broadcast Tv Channels , often named the 'Air Channels' or 'Antenna Channels' in the Tv setup menu because the Digital Tv transmissions travel through the air from the transmitting antennas to the receiving antenna.
Some Digital Tv's will automatic channel scan for cable tv channels.
Go into the Tv setup menu and select , 'Air Channels' / 'Antenna Channels'.
DO NOT channel scan for cable tv channels.