This chamber's radio is almost impossible to miss - but before you rush to grab it, consider that the door will close behind you. (It may be worth saving your game!)
What do I need to do?
Shoot a portal underneath the radio, and it will end up on top of the piston.
You can use a portal to get up there yourself afterwards.
Where do I need to take it?
Into the pit where you found one of the cubes. The light will turn green when it hits the bottom, so you can just throw it in there.
Guide help
This is the low-spoiler guide for "Transmission Received (Radio 6/26)" 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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