Here is the Federal Antenna Law that says Yes the owner of the town home can install and use a antenna above the roof.
http://www.fcc.gov?mb/facts/otard.html.
For reception of the digital Tv stations/channels to the south/east in the green and yellow reception zones down too and including , WOCK digital channel 4 ,
http://americaone.com.
Install a Winegard HD7082P antenna above the roof aimed at about 130 degree magnetic compass.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Here are some antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560 ,
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 places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.winegarddirect.com ,
http://www.amazon.com.