This recommendation is based on the Current Plus Pending Applications Included for Digital Tv stations/channels for the American Tv stations.
Above the roof install a Winegard HD7696P antenna with a Winegard AP8700 preamp aimed at about 160 degree magnetic compass.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Here are some Examples antenna mounts , other makers also make antenna mounts.
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.html ,
http://www.ronard.com.
Buy the ronard antenna mounts by typing the word ronard in the solidsignal search box or buy from ronard.
Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.winegarddirect.com ,
http://www.saveandreplay.com ,
http://www.trentondistributors.com ,
http://www.canadapost.ca/shopper ,
http://www.amazon.com ,
http://www.amazon.ca.