A Simple reception situation.
For reception of the Digital Tv stations/channel to the north east at about 30 degree magnetic compass direction.
Above the roof install a Winegard HD9095P antenna aimed at about 30 degree magnetic compass direction.
For 1 Tv connected use no splitter.
For 2 Tv's connected use a common simple 2 way splitter.
Here is how 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 ,
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.amazon.com ,
http://www.winegarddirect.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.
As always , tres and tree leaves do a real fine job of , reflecting , reducing , blocking , Tv reception and so do buildings and other obstructions.
It is best to locate the antenna at a location where there is the least amount to no amount of obstructions in the direction of reception.