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1. Check all your connections to make sure they are tight. If they were not really tight they can work loose over time. [Did you cut the coax and make the connections yourself or did you use pre-made lengths of coax?]
2. Inspect your antenna. Is it still facing towards the towers - likely about 205 degrees on a compass? Sometimes heavy winds can move it if it is not tight enough. Are the connections good? Sometimes water gets in and corrodes things.
3. Run a new length of cable directly from the antenna to one tv to troubleshoot (through a door or window as a test). If the stations all come in then likely your issue is in the wiring or your distribution amplifier.
4. Normally one takes into consideration trees and leaves in the spring, but your issues started last November. Is there good like of sight between you and the towers? No major buildings in the way? Has anything new been built in that direction?
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