The signal strength of the Tv transmissions are weak at your location.
Recommend Above the roof of the 2 story house install a Winegard HD8200U antenna with a Winegard AP8700 preamp , aimed at about 130 degree magnetic compass direction.
Here is how to aim antennas and etc. ,
http://www.kyes.com/antenna/pointing/pointing.html.
Here are some Strong and Sturdy antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.html ,
http://www.ronard.com.
Buy the ronard antenna mounts at solidsignal by typing the word ronard in the solidsignal search box.
Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.winegarddirect.com ,
http://www.amazon.com.
For 1 Tv connected use no splitter.
For 2 Tv's connected use a , HFS-2D 2 way splitter.
For 3 Tv's connected use a , HFS-3D 3 way splitter.
http://www.hollandelectronics.com , also at ,
http://www.solidsignal.com.
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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.