Complete the antenna installation on the roof

How do you complete "Complete the antenna installation on the roof"?

This is step 3 of 3 in Our Presence up There, given by Shani. It is completed on Dam Battlegrounds. The exact location is marked on the Dam Battlegrounds map.

• Our Presence up There
• Dam Battlegrounds

What are the other objectives in Our Presence up There?

Our Presence up There has 3 objectives in total: Visit the Pattern House in The Dam, Find and flip the power switch and Complete the antenna installation on the roof.