X-2: Strange Transmissions!

X-2: Strange Transmissions! is a side quest in the Fallout: New Vegas add-on Old World Blues.

Quick walkthrough

 * 1) Travel to the X-2 Transmitter Antenna Array.
 * 2) Climb up to the satellite dish and retrieve the X-2 Antenna.

Detailed walkthrough
When you are first allowed out of the Think Tank and the Sink, you are tasked with retrieving three pieces of technology, and the coil from the X-2 facility is the easiest one to do. When you enter, you will have minimal opposition: Three protectrons. These three are spread out at various levels of the tower, so if you want to dispatch them stealthily, the only major requirement is a silenced weapon. A more direct confrontation is also a piece of cake.

After you take care of the protectrons, climb the ladder to the top of the tower and use the support arms of the transmitter to reach the coil you need. After grabbing it, you will hear the scientists start to bicker again and Mobius will announce that transmitter station has been overrun by his robo-scorpions. With your new shiny coil, head back down into the facility.

When you enter, a handful of robo-scorpions are now populating the building, so be careful. The scorpions are tough, shoot lasers and will explode shortly after dying. If you can keep it quiet, you can get out with minimal confrontation. The stealthy way out involves killing the robo-scorpion blocking the exit in the upper areas of the facility, exiting and proceeding down the ridge to escape the scorpions. Fast travel is useless when you get back outside, as a handful of scorpions will be waiting for you at the main (lower) exit. If you have a sniper rifle, feel free to kill the scorpions; they'll have a hard time getting to you if you're on the ridge. The more confrontational approach would involve simply running down the stairs or using your position at the top to gun down the enemy scorpions on the ground levels, then proceeding to the main exit and killing the robo-scorpions outside, leaving you free to return to the Think Tank with minimal harassment.

A more pacifistic way of avoiding the Scorpions is to simply walk on the rim of the satellite dish until you set off the perimeter warning. You will soon be sitting on top of the Sink.