The following is a Teleview recommendation for broadcast Tv reception.
ABOVE THE ROOF install a Winegard HD7696P antenna with a CPA-19 preamp aimed at about 210 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
For 1 Tv connected use no splitter.
For 2 Tv's connected use a , HFS-2D , 2 way splitter.
Here are places to buy the HFS splitters.
http://www.hollandelectronics.com or
http://www.solidsignal.com.