If you can ask your neighbors if they are experiencing similar problems and they are, then it tends to put the fault out of your control but if no one else has problems, then something has occured with your system.
You dont mention how old the antenna/cables are so if the problem is your end, it could be loose/rusty connections, water in cable, cable damage through birds,rats etc.
I have seen the braid on a cable 'rust' through water ingress so it eventually went so high a resistance so that a multimetre gave an open circuit reading.
I read one servicemans story about taking the wall terminal apart and the connections fell to pieces in his hands through corrosion but externally all appeared satsifactory so check all no matter how good it looks.
And if its your house, dont repair, REPLACE and you wont have to do it again for a very long time.
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