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Here is the Federal Antenna Law that says Yes you can install a Tv antenna of any size above the roof so as to have Reliable Reception.
http://www.fcc.gov/mb/facts/otard.html.
Install a ,
http://www.antennacraft.net.
HBU11K antenna above the roof in such a manner that the roof and building are not , obstructing , impeding , blocking , reception in the directions of , South , South West , South East , North , North East.
Aim the HBU11K antenna at about 180 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.