Wait, isn't this all free energy, waiting to be harvested?
Or, literally, the energy is way too low to benefit from it. Sure, the TV might blanket space with a few watts of interference, but going by the law of quadratic decay that's not worth much at distance.
All this noise does is prevent observation of low-energy signals. It does not contribute to a high-energy signal itself. (Goes for both light pollution and RF noise.)
Edit: unless, of course, you mean we can "harvest" this free energy by making our appliances conform to regulations, in which case it's an obvious yes.