There are a number of possibilities why new coax improves signal strength:
- Better quality coax (e.g., RG-6 is better than RG-59, it has a larger center conductor
- Better or tighter connectors and connections
- Crimps in the old cable
- If old cable was outdoors and weathers (or with lots of sun-exposure) it may have deteriorated
- Water, heat or stomping damage to old cable
- Etc.
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