Before you purchase a new antenna try a rescan. Sometimes I lose local channels as well due to something going on at the TV station. But then after I rescan I usually pick up the station again.
If this does not work then they may have made a change to the way their signal is broadcast and you will need a new outdoor antenna. I ran into this problem here after one of my local stations had a transmitter failure and upon tinkering with the transmitter, after they returned to the air I noticed I no longer had a good signal for it and I had to make some changes on my own end.
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