How do you test the quality of a coax cable?

My internet is provided via a coax cable. The speeds are much less than advertised, and the ISP's technician said it's because my coax cables are low quality and degrade the signal.

The cables are long, go throughout the house, and basically I don't want to go to all that trouble without a way to verify that the existing cable is bad, and also measure the quality of the new one so I can actually see if it's any better.

How can I measure the quality of a coax cable, and see whether the cable is degrading the signal?

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How do you test the quality of a coax cable? Question

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