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Your problem is too much signal. Your only 10 miles from those million watt transmitter towers for WRAL and it's various stations. They already have a NM value greater than 60 and then you amp that up with the Winegard amp.
Your overdriving the tuner and it just thinks it's noise causing the pixels, drop outs, etc. You don't need to shoot for 100% signal strength, a better quality, low noise signal of 80% will be more watchable.
You shouldn't need any kind of amp at all. Try a broader beam width antenna pointed at WUNC, your so close to the towers north of you I don't think you'd have trouble picking them up at all.
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