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It is not transformers that are RF noise generators, unless there had something gone badly wrong with them. Linear power supplies with their large transformers seldom cause problems. Cheap poorly filtered switch mode power supplies are notorious generators of radio frequency interference that is more likely to affect VHF channels then UHF channels. The problem is such power supplies are quite common now days, and can be found through out a house making it sometimes difficult to find the offending one.
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