If as you say you have read other posts then you know about the Federal Law that says Yes you can install and use a antenna on the roof no mater what the hoa says. Here is the Federal Law ,
http://www.fcc.gov/mb/facts/otard.html. The owner of the house in your situation is the one that decides if a antenna is put on the roof or not. That said. If the antenna must go in the attic then pointing the antenna at about 95 degree magnetic compass is a good aim point. Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html. Install a Winegard HD7696P antenna with a Antennas Direct CPA-19 preamp in the attic , the HD7696P antenna will hopefuly fit in the attic space and aim in the correct direction. Most attics have a electric outlet , so put the preamp and the preamp power supply in the attic. Here are some places to buy antennas and etc. ,
http://www.winegarddirect.com ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.ramelectronics.com ,
http://www.tigerdirect.com. If the owner of the house decides that the antenna can go on the roof then here are some roof top antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.html ,
http://www.ronard.com. Buy the ronard mounts from solidsignal by typing the word ronard in the solidsignal search box. ( Now Back To The Attic ) If the house does not have a metal roof and does not have stucko WIRE on the outside walls then the reception should be Ok for the digital tv stations/channels in the green and yellow reception zones of the tvfool radar map. With the antenna in the attic. If the aim of the antenna in the attic is at a outside wall that has stucko Wire , then try and aim the antenna through the roof if the roof has standard composition shingles or clay tiles.