This radio is in front of the door you can open after grabbing the portal gun upgrade.
How do I grab it?
It's in a precarious spot, but that's never stopped you before. Shoot your blue portal next to the doorway, then peek through the orange one to grab it. You don't need to grab the portal gun upgrade for this, but it does remove the time pressure.
Where do I take it?
The light will turn green when the radio is taken to the platform where the upgraded portal gun was.
Guide help
This is the low-spoiler guide for "Transmission Received (Radio 12/26)" 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.
Hi! I have written video game guides since 2018. Any money I make here will go towards improving my equipment so I can make the things you enjoy even better (and faster!)