In the attic install a Winegard HD9095P antenna aimed at about 20 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
For 1 or 2 Tv's connected use a Channel Master CM3410 distribution amplifier.
Most attics have electric power outlet , put the CM3410 in the attic if you can.
Having 2 Tv's connected will not degrade reception.
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The receivable Digital Tv stations/channels to the North are UHF TV stations/channels 14 thru 51.
Examples:
The channel list of the tvfool radar plot report shows the Real Digital channel being transmitted and received , and the virtual number.
WGBH-DT , REAL Digital UHF channel 19 , virtual number (2.1) , PBS.
WHDH-TV , REAL Digital UHF channel 42 , virtual number (7.1) , NBC.
WFXT-DT , REAL Digital UHF channel 31 , virtual number (25.1) , FOX.
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Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.winegarddirect.com ,
http://www.channelmasterstore.com ,
http://www.amazon.com.
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.
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WWDP-DT , REAL Digital VHF channel 10 , virtual number (46.1) , Shop NBC Channel.
Can be added to the reception of the North group of UHF Tv stations/channels , install a Winegard YA1713 , VHF high band channel 7 thru 13 antenna aimed at about 105 degree magnetic compass direction.
Use a UVSJ = UHF/VHF Separator/Joiner to Combine the HD9095P and the YA1713 togather.
The HD9095P is connected to the UHF connection and the YA1713 is connected to the VHF connection and the remaining connection of the UVSJ is connected to the CM3410.
Type these letters -> uvsj , in the solidsignal search box.