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The VHF--particularly the low (2-6) band is highly susceptible to this sort of interference. It is usually caused by digital equipment and sometimes switching-type power supplies such as is used in computer and compact electronic equipment. The little plaything on top of that telly and to the right may be your culprit if it is even plugged into an outlet. This also is not uncommon when modern gear like that converter is used with older sets with 300ohm twin lead-in. Newer sets have much more secure shielding against spurious RF created by today's digital stuff.
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