The largest group of Digital Tv stations channels is/are to the , North - North West.
You can Test reception with a Terk HDTVi antenna (not HDTVa) antenna in a window in the South East direction that has a smaller group of Digital Tv stations/channels and will most likely receive some of the , North-North West Digital Tv stations/channels also.
Here is how to aim indoor and outdoor antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real and Actual magnetic compass to aim antenna.
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The Tv Must Be Able to scan for the Digital Broadcast Tv channels , the ATSC Digital Broadcast Tv channels , aka , 8VSB Digital Broadcast Tv.
If the Tv is a older Analog Tv or is a type of Tv monitor with no Digital Broadcast Tv tuner.
Then.
Walmart sells a basic Digital to Analog tuner , the RCA DTA800B1 converter box.
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Here are some converter boxes that do more.
http://www.epvision.com.
Channel Master has Digital Tuner boxes.
http://www.channelmasterstore.com