A Teleview Recommendation.
For reception of the Canada and USA Digital Tv stations/channels in the , Green , Yellow and Red zones.
Above the roof install a Winegard HD7698P antenna with a Antennas Direct CPA-19 preamp aimed at about 180 degree magnetic compass direction (south).
Use the CPA-19 preamp because the CPA-19 preamp has high over load resistance.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
For 1 Tv connected use no splitter.
For 2 Tv's connected use a 2 way splitter.
For 3 Tv's connected use a 3 way splitter.
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Some common above the roof antenna mounts are , tripod antenna mounts , eave antenna mount , chimney antenna mount.
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Here are some places to buy antennas and etc. ,
http://www.saveandreplay.com.
http://www.trentondistributors.com.
http://www.canadapost.ca/shopper.
http://www.amazon.ca.
http://www.winegarddirect.com.
http://www.solidsignal.com.
http://www.amazon.com.
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As always , trees and tree leaves do a real fine job of , reflecting , reducing , or blocking , Tv reception and so do buildings and other obstructions.
For best reception mount the antenna where there is the least amount to no amount obstructions in the direction of reception.
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The Tv/s Must Channel Scan for the 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.