VANTAs absorb well in the visible and infrared range, but not radio waves. They would also show up in IR, shedding all the heat they soaked up from the sunlight

VANTAs absorb well in the visible and infrared range, but not radio waves. They would also show up in IR, shedding all the heat they soaked up from the sunlight. Absorption is not the full story when you're in thermal equilibrium and also emitting the same amount of energy.