It looks like this one:
http://www.kyes.com/antenna/pointing/pointuhfpanel.jpg
I believe it supports both uhf and vhf. The attic is wood frame and the roof has asphalt shingles. The antenna is located near a lot of HVAC duct work...
I did test it outside before mounting in the attic and from what I remember the reception was great on all channels, however I didn't test it long enough to notice any fluctuations. Just holding and pointing in the correct direction I was able to get great reception so I assumed that once it was elevated in the attic and mounted using a compass for direction there wouldn't be any problems.
Thanks for the help.