It is interesting the (point of view) or is it (misinformation) that people have. Mounting above the roof is the first choice for Tv antennas for a nice clear strong signal. Mounting in the attic is a lesser choice. Here are 2 antenna mounts that do not put holes in the roof.
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.html