The Antenna Map is an area you can access when you progress through the main story quest. The mission that allows you to access this map is the “Broadcast” mission. You’ll want to go back to this map if you want to obtain the the airstrike blueprint, if you missed it the first time you landed on Antenna. If you’ve already passed this map, then you might be wondering how to go back there without restarting the Broadcast mission.
Well, there’s actually an “entrance” to the Antenna map from the Slums or Old Town.
Travel to Antenna Map From Slums:
To go back to the antenna map from the Slums, go the northern safe zone on slums, the one located on the broken bridge.
From there, you’ll see a door on the left that gives you access to the “Sewers”. This is where you can access the antenna map.
Travel to Antenna Map From Old Town.
To go back to the Antenna map from Old Town, there is an underground passage north of Old Town.
When you go down, open the left gate, then head down the stairs. You’ll see another gate on the left as shown below. Open it and you’ll then see the door that leads to the sewers, which leads to the antenna map.
From there, you’ll find yourself inside one of the bridge “control room”. You’ll have to pass the bridge tunnel which has some zombies but you can just ignore blaze through them .
Going to the antenna map this way won’t require you to pass that long sewer tunnel which you go through during one of the previous missions.