Firstly, herringbone patterning is a good choice of words because that's
exactly the correct phrase for this kind of interference.

While the VCR is playing a tape pull out the aerial from the VCR. Is the
picture clear now?

Assuming it is, it means that the RF channel your VCR is set to is the same
as, or adjacent to a broadcast channel coming down your aerial. This may be
from a different transmitter from the one you normally receive.

You say you tried a different channel (programme) number other than 0, but
what you didn't do is change the RF channel your VCR is outputting.

With very old VCR.s this was done with a screwdriver adjustment in the back
of the machine, nowadays you will have to look through the installation
menus or RTFM.

As you are in the UK, all of the preceding is in one sense irrelevant.
Is your TV and VCR equipped with SCART sockets?
If so why don't you use them?
For one thing if your equipment is stereo you wont get stereo playback when
connected via the aerial socket of the TV, as no VHS machine outputs a NICAM
signal when playing back.

Also, in many cases, when you hit play button the TV will automatically
switch to the SCART source.





--
Graham.



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