This chamber's radio is very difficult to miss; it falls out of the cube dispenser and lands in the pit next to - or sometimes underneath - the cube you need to rescue.
Where do I need to take it?
Back to the elevator you used to enter the chamber. The light will turn green when you pass the information board.
Guide help
This is the low-spoiler guide for "Transmission Received (Radio 5/26)" puzzle in Portal. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.
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