Not sure if any of this will actually help. Channel 5 went back to broadcasting on channel 5 when analog got cut off and those low frequencies tend to be the hardest to get. Is your antenna a yagi style? Those are the old school looking ones with the cross bars forming sort of a triangle. That is actually the type of antenna that will work the best. Some of the antennas sold as "dtv antennas" (really no such thing) were mainly UHF antennas since that is where most of the HD channels were when they were being simulcast with the analog channels. Some stations kept their UHF frequencies but others (like WOI) moved back to the VHF frequency they used for analog. I think it was a mistake, but then again they had a crappy UHF frequency so they didn't really have a good option.
Are you using a splitter at all? I just was battling a similar problem today and sound out that since the digital signals are actually a weaker signal than the old analog channels were, some older splitters will actually filter out their signal. I unhooked the splitter and connected antennae straight to the tv and the problem was solved.
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