Gremlins in my TV?

I have a non-digital TV and basic cable. Six months or so the picture on channel 67(basic) was distorted, wobbly, whatever. That lasted for about
two weeks; it cleared up. Then 66(basic) went on the fritz. Same thing - distorted, wobbly, whatever.
This trend has continued. Now 62(basic) is screwed up; the other channels work.
Do you have any idea what might be causing this? Ghosts, gremlins, goblins? Thanks
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Some form of local interference which is not very frequency stable.
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From KT24 - in "Leafy Surrey"

Using a RISC OS computer running v5.11
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