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I recommend a 1 antenna solution.
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For reception of the Canada and USA Digital Broadcast Tv Stations/Channels.
Install a ,
http://www.antennacraft.net.
HBU44 antenna above the roof in such a manner that the roof and building are not , obstructing , impeding , blocking , reception in the directions of , East , South East , South South West.
Aim the HBU44 antenna at about 157 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real and Actual magnetic compass to aim antenna.
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A antenna system amplifier will most likely not be required for 1 or 2 Tv's connected.
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Here are some places to buy antennas and etc. .
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http://www.antennacraft.net
The Antennacraft web site shows Canada sellers of Antenna Craft.
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http://www.trentondistributors.com
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http://www.saveandreplay.com
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Here are some above the roof antenna mounts.
http://www.ronard.com/909911.html.
Use the , ronard(911) , 5 foot tripod antenna mount.
http://www.ronard.com/34424560.html.
Use the , ronard(4560) , eave antenna mount.
http://www.ronard.com/ychim.html.
Measure around the chimney and use a , ronard(2212) , ronard(2218) , ronard(2224) .
http://www.ronard.com.
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As always , trees and tree leaves , plants and plant leaves , have a Negative Effect on Broadcast Tv Reception and so do buildings and other obstructions including your own roof and building.
Some and not all Negative Effects are.
Absorbing and Blocking Reception.
Multi-Path Reflecting Tv Signals Bouncing All Around.
The Best Practices for Reliable Reception is to install the 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 building.
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Digital Tuners can develop -Digital Glitches- that are not cleared out with simple channel scans.
To clear tuner do Double Rescan.
http://www.wchstv.com/DoubleReScanAlert.pdf