Above the roof in such a manner that the roof or house is not blocking reception to the , north west , west , south west , install a Winegard HD7084P antenna with a Antennas Direct CPA-19 preamp aimed at about 240 degree magnetic compass direction.
Here is how to aim antennas ,
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/Tripods%200703/4712.html ,
http://www.ronard.com/ychim.html ,
http://www.ronard.com/34424560.html if using the eave mount then use the #4560. ,
http://www.ronard.com.
Buy the ronard antenna mounts at solidsignal by typing the word ronard in the solidsignal search box or buy from ronard.
Here are places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.winegarddirect.com.
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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.
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As always trees and tree leaves do a good job of , reflecting , reducing , blocking , Digital Tv reception and so do buildings and other obstructions including you own roof and house.
It is best to locate the 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 ow roof and house.
The Tv's Must Channel Scan For the 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 will automatic channel scan for cable tv channels.
Go into the Tv setup menu and select 'Air Channels' or 'Antenna Channels'.
DO NOT channel scan for cable tv channels.
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Digital tuners can develop - Digital Glitches - that are not cleared out with a simple channel scan.
Do a Double Channel Scan.
http://www.dtv.gov/rescan.html.
And also in the future ,
http://transition.fcc.gov/cgb/consumerfacts/rescan.pdf.