Here is the Federal Law that says Yes you can mount a Tv antenna outside and above the roof.
http://www.fcc.gov/mb/facts/otard.html. Your location has receivable English speaking Tv stations/channels being transmitted from more directions ( 3 different directions ) then the one direction that the stacker is designed to receive. Install a Channel Master CM3000A antenna above the roof in a manner that the CM3000A has a good clear view of all directions.
http://www.channelmasterstore.com. Here are some antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.com ,
http://www.ronard.com. Type the word , ronard , in the search box at
http://www.solidsignal.com or buy from ronard.