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Did you do a Double Rescan??
Digital Broadcast Tv Tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
Do a Double Rescan.
http://www.wchstv.com/DoubleReScanAlert.pdf.
Also please make and post a tvfool report for your location.
Use the Exact address to make the tvfool report and make the antenna height in the report 25 feet above ground.
If the Exact address does not work , then go to the tvfool home page and click on >>Start MAPS<<.
Select a location close to your location and then move the pointer to your exact location.
Make a tvfool report with the antenna height at 25 feet above ground and post the tvfool report.
Is this a , house , town home , condo , apartment , mobile home , motor home , or etc.??
How many floors??
What is the top floor??
What directions do , windows , patios/balconies face??
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What is the make and model number of the antenna??
Is a amplifier being used??