If required.
Here are some roof top antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.tvfool.com/ychim.html ,
http://www.ronard.com.
Buy the ronard antenna mounts at soldsignal by typing the word ronard in the solidsignal search box.
Here are places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com