One early Call of Duty: Modern Warfare 4 DMZ mission asks you to place a transmitter on top of two radio towers, for the "Triangulation" order during the first part of the "Underground" chapter. This is as far from underground as you can get though, because you need to scale two radio towers to complete this objective.

Here's a full explainer on how to place a transmitter on top of two radio towers in Modern Warfare 4's DMZ mode.

The way this objective is worded, it makes you think you need a specific "transmitter" item, but that is not the case. Deploy into Hajin and open your map. With this objective active, you'll see every radio tower on the map, including lieutenant towers, is marked with an orange icon. See the image above for an example, which shows multiple radio towers on the map.

All you need to do when you reach a radio tower is climb to the top, then look for the prompt to place a radio transmitter. It'll be on one of the metal poles making up the frame of the tower. Do this twice and the objective will be complete. After this, you just need to do the same at the top of La Grand Vie in Songdo Wharf, which is a named location to the east of Hajin.

We also have guides on how to increase your stash size , how to find a dynamic op phone , and how to get electronic sensors in DMZ.

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