I Simple reception situation , Many Digital Tv stations/channels will be received.
Above the roof install a Winegard HD7000R antenna in such a manner that the roof or house is not blocking reception to the , east , south east , south , south west , north west , north east.
Aim the HD7000R antenna at about 125 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/34424560.html the 4560 eave mount ,
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.
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No preamplifier is required.
For 1 Tv connection use no splitter.
For 2 Tv's connected use a common simple 2 way splitter.
For 3 Tv's connected use a common simple 3 way splitter.
For 4 Tv's connected use a common simple 4 way splitter.
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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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As always , trees and tree leaves do a real fine job of reducing or blocking Tv reception and so do buildings and other obstructions including your own house.
It is best to install a 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 house.
The Tv/s Must channel scan for the Digital Broadcast Tv Channels , sometimes named the 'Air Channel' 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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More practical and useful web sites.
http://columbiaisa.50webs.com/homepage.htm.
http://www.rabbitears.info.
http://www.ftalist.com.
http://www.ramelectronics.net.
http://www.sewelldirect.com.
http://www.tigerdirect.com.
http://www.wdc.com/en/products/products.aspx?id=570.
http://www.slingbox.com.
http://www.startkelectronic.com.
http://www.dtv.gov/rescan.html.
http://transition.fcc.gov/cgb/consumerfacts/rescan.pdf.
http://wwitv.com.