The following is a Teleview recommendation for broadcast Tv reception.
Above the roof install a Winegard HD7000R antenna (with no preamp) , aimed at about 0 degree magnetic compass direction (north).
For 1 Tv connected use no splitter.
For 2 tv's connected use a common simple 2 way splitter.
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 ,
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.soldsignal.com ,
http://www.amazon.com ,
http://www.winegarddirect.com.