I guess my first thing would be to try to start at the source (the antenna). Check the terminal connections, maybe take a piece of sandpaper and some dielectric grease up with you. If possible, take a small TV with you and confirm signal strengths at the antenna. Then check downstream of your pre-amp (if you have one), and then downstream of each component in your distribution network in sequence. Maybe it is the trees leafing out? Do you have trees that are growing taller and taller each year?
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