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How does one generate that signal and then radiate it efficiently?
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It's not a signal, it's heat. Sort of the opposite.
https://www.skycoolsystems.com/technology/
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Dual-Mode Film serves numerous applications- Applied to outdoor batteries or electronic boxes
- Applied to outdoor shaded structures
- Applied on metal roofs
- Applied to refrigerated trucks or other vehicles
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It's a foil with alternating layers of two materials. Something like a vinyl wrap that works better than Ultrawhite paint.