I live in southern wisconsin ,zip code 53566 and want to pick up Rockford, Illinois stations. The transmitters are only 33 miles to the southeast. I mounted a RCA Ant 751 in my attic and pointed it at 130. The picture went in and out. I tried an amplifier from Walmart, but it didn't help. I especially would like to pick up Fox 39 , which seemed to be the worst. Would a larger "old Fashioned" mast antenna help, or do I need one of those HD Amplified units? I would prefer to keep it in my attic. Help!!