I recommend a Antennas Direct DB4e antenna aimed at about 305 degree magnetic compass direction.
Here is how the aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Install the DB4e antenna above the roof in such a manner that the roof or house is not blocking reception to the north west.
The Digital Tv stations/channels to the - north west - are strong signal strength in the Green and Yellow reception zone.
No preamplifier is required.
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.
Common simple splitters can be bought at Home Depot or Lowes or Walmart.
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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 ,
http://www.ronard.com.
Buy the ronard antenna mounts at solidsignal by typing the word ronard in the solidsignal search box.
Yes the J type antenna mount can also be used.
Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com.
As always , trees and tree leaves do a real fine job of reducing or blocking Tv reception and so do buildings and other obstructions including your own house.
It is best to install the DB4e antenna at a location that has the least amount to no amount of obstructions of any type or kind in the direction of reception including your own house.
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.