Above the roof in such a manner that the roof and building are not impeding and blocking reception to the , North East , East , install a Channel Master CM4228HD antenna aimed at about 57 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Old School magnetic compass to aim antenna.
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A Winegard DS3000 J pole type antenna mount works Ok with the CM4228HD antenna.
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Install a Winegard , LNA-100 'Boost' amplifier.
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Here are some places to buy antennas and etc. .
http://www.solidsignal.com.
http://www.amazon.com.
http://www.winegarddirect.com.
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The Tv/s Must Channel Scan for the Digital Broadcast Tv stations/channels , often named the 'Air Channels' ~ 'Antenna Channels' in the Digital Tv Setup Menu.
Some digital tv's will Automatic channel scan for cable tv channels.
DO NOT channel scan for cable tv channels.
Go into the Digital Tv Setup Menu and select 'Air Channels' ~ 'Antenna Channels'.
Scan for channels.