The follwing is a Teleview - recommaendation for digital broadcast Tv reception.
A Simple reception situation.
Above the roof install a ANT751 antenna , with No preamplifier , aimed at about 290 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
http://www.solidsignal.com , has the ANT751 Antenna with a J Type Antenna Mount for low dollars.
For 1 Tv connection use 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.
As always , trees and tree leaves do a real fine job of reducing or blocking Tv reception and so do buildings and other obstructions.
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 transmissions travel through the air from the transmitting antenna to the receiving antenna.
DO NOT channel scan for cable tv channels.