> Have them on, with some plants shielded partly with metal How are you going to make sure they get light? I get "partial", but that means you're letting in a bunch of "radiation" too. > Shit, if this really worked, they could set up radio signals outside to prevent weed growth. It would save lots of money. Depending on how far the affect reaches, that may or may not be practical. I'm pretty sure having a router in the same room doesn't inhibit plant growth. People keep houseplants in the same room as WiFi all the time.