A local dealer recommended an "8 bay" 36" x 36" UHF only attenna for HD reception in my area (Seacoast NH). As the crow flies this is only about 45 miles to towers. Is it plausible that an attic installation would provide enough signal strength? How important is orientation of attenna ...is it likely that a fixed installation would be adequate for the major network feeds? Feedback from anyone whose been there would be appreciated.