Galaxy News Radio (quest)

Galaxy News Radio is a Fallout 3 quest connected with the Galaxy News Radio station. It is also an Xbox 360 achievement.

You must find a radio dish on the Lunar Lander in the Museum of Technology and place it at the top of the Washington Monument.

While normally you must complete this quest before you can proceed with the main quest, there are two ways to skip it. You can either use the speech skill on Three Dog, at which point he will give you a clue to your father's whereabouts without requiring you to do the quest first, or you can simply travel to Rivet City unprompted and meet with Doctor Li directly. You can still choose to do the Galaxy News Radio quest later by talking to Three Dog. Also, talking to Doctor Li and then completing the quest and talking to Three Dog leads to him giving you the key to a weapon cache.

Quest
To begin this quest, proceed down the stairs (in the same area as Three Dog) to the backdoor of the Galaxy News Radio (station) leading to the car tunnels to Dupont Circle.

NOTE: You will meet many hostile Feral Ghouls, Super Mutants, Wild dogs and Raiders in the tunnels, so Fast Travel to Megaton first to stock up on Stimpaks, ammo and weapons. If you have any form of Assault Rifle and Small Guns this quest should be much easier.

Enter the car tunnel door and walk through the tunnels exiting into the outdoors. Enter the Dupont Station, where you will encounter two Super Mutants. Headshots with an Assault Rifle will finish them off, and these will be the last two in the station. Follow the way points (heading south and staying on the Red Metro line always) for a long but easy distance, passing the Central Station, then later arriving at the Museum.