Why can radio waves penetrate household walls but not light? : askscience
How do radio waves penetrate brick walls?
But you can safely listen radio in your room.
electromagnetic radiation - How do signals go through solid objects? - Physics Stack Exchange
Think of a throwing a Frisbee at a picket fence. Ok, now let us take a look at your question.
Think of a throwing a Frisbee at a picket fence. Some materials can block the radio waves that the transmitter generates, which can be tested by seeing whether a receiver can process and respond to information sent by a transmitter.