Been a relatively happy 811 user for 6 months. Live in Oracle, Az. at 5000 foot elevation and have line of site to Phoenix stations 90 miles distant. Have enjoyed all network HD feeds until late last month. At that time, ABC-15 completely fell out. Rechecked antenna allignment and all is well. Several e-mails to the engineering folk at ABC have gone unanswered..... guess a phone call is next. Before I ring their bell, anyone have any knowledge of recent transmission changes on their part ? I'm thinking along the lines of reduced transmission power. Thx in advance.