Just FYI, wdaf has been having transmitter issues lately. A few weeks ago someone told me they've been having issues for a while now, and then last week it dropped out on both my OTA, and on DirecTV. Directv put up a tech difficulties banner for an hour before they got it back, but it was a further day and a half before I got anything OTA.
Before you go overboard trying to get them to come in, you might see if anyone in your area has a known working setup. It would suck to spend a day on the antenna tower if the problem's at the transmit end.
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