Those both technologies are usable in real world situations. Isolating video signal needs typically active technology which involves electro-optical isolation or differential amplifier with a floating ground on the input connector. Isolating video signal is more complicated than isolating audio or antenna signals, because the DC level of the video signal is important and video signals have very high frequency spectrum (normal composite video can have bandwidth from 50 Hz to 6 Mhz). Ground loop isolation in video lines Ground Loop Isolator GB0001 Cross-Talk: Ground loops can cause one signal to interfere with another, because every cable should ideally return through the corresponding shield conductor, but there's an alternative path through the other shield conductor which causes undesirable voltage differences to nearby cables.These antennas are especially adept at picking up AM broadcasts if most of the loop is vertical. Any large loop of wire makes a good AM antenna.
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