What are you using for an antenna? Any pre-amp? Where is the antenna mounted?
Gradual loss of reception is usually a sign of one of the following:
1. Water infiltration into baluns or coax or the effects of corrosion in connections.
2. Tree and foliage growth in front of or near the antenna.
3. Changes in the environment such as new construction or new electrical interference sources.
All of your available signals come from the translators at Orderville. Have you contacted the operator of the translators [The licensee is WESTERN KANE COUNTY SPECIAL SERVICE DISTRICT #1] and ruled out operational issues on their part?
Based on your chart, a uni-directional UHF antenna would be the appropriate selection. Depending on your cabling and any splits, a pre-amp might or might not be needed.
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