Too many variables for a specific yes or no answer.
Post your TV Fool plot, identify the station(s) in question, identify your antenna and describe the rest of the receiving system. If possible, take and post a photo of the signal path to the desired stations as "seen" by the receiving antenna.
I've installed antennas where every signal was in the gray with NM values between -10 and -20 with good results. I've also been to locations where everything was green or yellow, but local obstacles, usually thick trees or a big hill, killed reliable reception despite everything being done correctly.
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