Hi, I am hoping you can help me. I had Directv install the HD DVR on Saturday with their OTA. I can view channels 4 and 5 in HD but I cannot receive any of the other OTA channels such as channel 7, FOX, 38 and 56 in HD. I live 20 miles south of Boston. All I get when I try to view them is searching for a signal. Do you think the Zenith sensor antenna will help or could the problem be in my satellite receiver. All of the regular satellite stations come in just fine. Thank you for your help