A simple reception situation.
Above the roof install and aim a ANT751 antenna at about 135 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html
Solidsignal has the ANT751 that comes with a J mount antenna mount.
Not much money.
For 1 Tv connected 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.
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.