The main group of Digital Tv stations/channels is at about 46 degree magnetic compass direction.
I recommend a ANT751 extended out past the balcony and aimed as close to 46 degree magnetic compass direction as you can get it.
The Tv transmissions are Very Strong , DO NOT use any type or kind of antenna amplifier.
The small group of Digital Tv stations/channels to the west will be received by the ANT751 also.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
You can try for the Tv stations/channels at 175 degree magnetic compass direction , on the other end of the balcony at 210.
Stick a ANT751 out past the balcony to get it aimed as close to 175 degree magnetic compass as possible.
The Tv transmissions are Very Strong , DO NOT use any type or kind of antenna amplifier.
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There are some USA Digital Tv stations to the south east , the Tv stations are Weak but receivable with a Unobstructed view.
With a unobstructed view , use a Antennas Direct DB4e antenna aimed at about 125 degree magnetic compass.
The USA Tv stations/channels will not be received through concrete.
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The Tv 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.