A highly directional antenna will help cut through the multipath.
Above the roof install a Winegard HD7082P antenna with - no preamplifier - aimed at about 166 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Here are some strong and sturdy antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/ychim.html ,
http://www.ronard.com/34424560.html if using the eave mount use the #4560. ,
http://www.ronard.com ,
http://www.ronard.com/Tripods%200703/4712.html
Buy the ronard antenna mounts at solidsignal by typing the ronard in the solidsignal search box.
Here are places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.winegarddirect.com.
For 1 Tv connected use no splitter.
For 2 Tv's connected use a simple common 2 way splitter.
For 3 Tv's connected use a simple common 3 way splitter.
____________________________
As always , trees and tree leaves do a real fine job of , reflecting , reducing , blocking , Digital Broadcast Tv transmissions and so do buildings and other obstructions including your own roof and house.
It is best to install the HD7082P antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own roof and house.
Here is another way to get the antenna higher , No guy wires , Free standing , Light weight aluminum tower , The tower lays over , do all antenna install a adjustments standing on the ground.
http://www.palcoelectronics.com/pe.aspx