MAIN QUEST 6: Radio Galaxy News
Received from: Three Dog [Galaxy News Radio - RGN Studios]
Solution: Important! If by any chance Three Dog is dead, then you won't be allowed to fulfill this particular assignment. You will have to find Rivet City on your own. After that, your task will be to find Doctor Li and to ask her for help. This will automatically trigger a new main quest - Scientific Pursuits. The similar situation is when you've decided to visit Rivet City early during the course of the game. If you activate Scientific Pursuits there, you won't have to complete this assignment, because you'll already know where James has went, so Three Dog won't offer any useful knowledge.
Your first assignment will be to find a missing dish. In order to do that you will have to travel to the Museum of Technology. Make sure that you're fully prepared for this mission, because this time you will be killing supermutants without brotherhood's assistance. Don't forget to take the fatman for this mission with at least 5-10 mininukes. You should reach the museum area through the subway tunnels. You can use several different passageways, however I would recommend that you start from Anacostia Crossing. This station is located to the north of Rivet City. Kill all enemy units, use the stairs and open a large metal gate to get to the tunnels. I guess you won't be surprised to hear that you will have to kill a lot of bandits inside. Use your map to find the correct route. Try getting to the Museum Station. Use the gate (screen) to reach the Mall area. Notice that you've left the tunnels very close to the Museum of Technology.
You will have to be extremely carefule outside the museum, because this entire area is swarming with supermutants. You can engage them in battle or you may proceed directly to the museum building. Travel to Museum of Technology - atrium. I'd strongly recommend that you choose one of the stronger guns from your inventory. This time it's not going to be possible to run away. If you don't want to fight all the mutants, consider remaining unnoticed, but you must have a high sneak skill and a stealth boy in your inventory to prevail. You can also hack into a computer terminal in order to activate museum turrets. Once you've defeated all monsters, proceed to the first floor. In order to get to your current destination you will have to travel through a fictional vault (screen). It shouldn't be a problem, especially since there's no one inside. Exit the vault and proceed to the nearest door. You'll get to Museum of Technology - west wing.
If you didn't spend any points to expansion of your science and lockpicking skills, you may choose the most obvious route to your current destination. Sadly, this means you'll have to go through A LOT of dangerous monsters. Use guns such as a fatman, a plasma rifle and a rocket launcher against them. The dish itself is protected by a very strong group of supermutants. Check the location of this object on my screen. If you can hack or lockpick, there is more room for being creative. There's a corridor in the north-west section and you can get there through the planetarium. Open the lock with a bobby pin or hack the terminal. Sadly, if you decide to use the computer, enemy supermutants will appear inside the planetarium and you'll have to kill the monsters before moving on. Once you're in this corridor, look for a door to your right. Head to the upper floor and find a new terminal. Use it to activate more turrets.
It doesn't really matter whether you'll decide for an open battle or sneak around, because you must get your hands on the dish. Once it's in your possession move back the same way you came and avoid other supermutants if possible. Now you must travel to The Washington Monument. Thankfully, it's going to be much easier here, because the monument is being defended by brotherhood units, so even if you're chased by supermutants, you can allow your colleagues to get rid of the monsters. Activate the security terminal and open the main gate (you won't have to hack into the system). Proceed to the door and enter The Washington Monument. Once inside, find an elevator and use it to get to the top. Approach a small radio (screen) and press the action key. Obviously you must install the dish from the museum. Also, if you're science skill is high enough, you will be allowed to make the transmitter more effective so it'll broadcast to a much larger area from now.
Once you've installed the dish, leave the monument and go back to the Galaxy News Radio building. Obviously you'll have to talk to Three Dog again. Ask him where to look for your father. Three Dog will answer to your question and he will also inform you about his stash in Hamilton's hideout.