LED replacements that have a wide voltage range (usually 9 to 36V) also can cause interference, the designs use a switching regulator to allow the wide voltage range. If not well designed they will emit RF interference that will affect TV reception. Funny thing, because the wide range LED lights are generally regarded as being better and more reliable than the cheaper ones that have a simple resistor to limit the current.
My DIY LED lights, which use a switching regulator, cause TV reception to get worse when they are on, fortunately I have some simple resistor LED lights that don't affect TV reception. Obviously my DIY lights were not designed to minimize TV interference, but any commercially purchased lights, especially from a reputable US vendor, should pass the FCC regulations regarding interference.
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Stewart, Brenda and kids
2008 Newmar Canyon Star 3410, now at a new home
2006 Roadtrek Versatile 210
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