Install a Winegard HD7698P antenna above the roof. Aim the HD7698P antenna at about 66 degree magnetic compass. Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html. . Here are some roof mounts ,
http://www.ronard.com/9009911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.html. With this antenna a preamplifier will not be needed. The antenna collects a lot of signal / signal strength to the tv. And the antenna does a very good job of rejecting multipath/reflected signals that can interfer with reception. . Here are places to buy antennas and etc. ,
http://www.winegarddirect.com ,
http://www.solidsignal.com ,
http://www.amazon.com