Good Deed #2: Insult to Harm
For this specific quest, you need to go straight then left alongside the primary street simply previous the APC. You need to see an deserted shed and, past that, there’s a ruined fort. There’s a corpse by the facet of the street and the poor fella has the Antenna Key.
Subsequent, progress the Marastan principal quest till you end the duty from an NPC named Talis. He’ll provide you with a special key that allows you to enter the tunnel that results in the observatory.
Head deeper into the tunnels till you see a cliffside opening. Drop down the ledges and use the Antenna Key on the published tower. This lets you deactivate it utterly.
