Many , many , many , Digital Tv channels will be received.
Above the roof in such a manner that the roof and house are not blocking reception in all directions install a Winegard HD7000R antenna aimed at about 173 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Here are some above the roof antenna mounts ,
http://www.ronard.com/909911.html.
,
http://www.ronard.com/ychim.html ,
http://www.ronard.com/34424560.html if using the eave mount use the #4560. ,
http://www.ronard.com.
Can also use a Winegard DS3000 J pole type antenna mount.
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No preamplifier is required.
For 1 Tv connected use no splitter.
For 2 Tv's connected use a simple common 2 way splitter.
For 3 Tv's connected use a simple common 3 way splitter.
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Here are some places to buy antennas and etc. ,
http://www.winegarddirect.com ,
http://www.solidsignal.com ,
http://www.amazon.com.
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As always , trees and tree leaves do a real fine job of , reflecting , reducing , blocking , Digital Tv reception and so do buildings and other obstructions including your own roof and house.
It is best to install the HD7000R antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own roof and house.
The Tv/s Must Channel Scan for the Digital Broadcast Tv Channels , often 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.
Some Digital Tv's automatic channel scan for the cable tv channels.
Go into the Tv setup menu and select , 'Air Channels' / 'Antenna Channels'.
DO NOT channel scan for cable tv channels.