Can anyone please help with this problem first noticed severe patterning on 
BBC two from Mendip (channel 64) on Saturday morning, which after a couple 
of signal bursts suddenly cleared, however I noticed it was back again this 
morning with a vengeance, all other channels are perfectly clear. There are 
six receivers fed from a decent Labgear distribution amplifier all 
exhibiting exactly the same problem, I have to confess that I haven't tested 
the aerial feed directly into a test TV but I'm virtually certain that it's 
some kind of external interference.

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