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Thanks for the reply.
We have our TV set up to automatically fix the ratio depending on the broadcast transmitted from the station. Channel Five was never a problem until only a couple days ago. All the other channels are still working okay.
Apparently, so I'm told, it's the weather and high pressure over the country affecting the signals. Hopefully it will settle down out by the weekend not that I watch much Channel Five anyway - it's just guff. Over and out.