That's a pretty vague request if you ask us, so we put together this guide to give you an idea on where they go, and how to place them.
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Alien Light Communication Device Locations
There are four total locations that you can place these devices, and they're all bunched together nicely towards the South-East section of the map. Fortnite being kind to us with the placement, how nice.
You only need to visit two sites and place two devices so it's up to you which way you approach the locations. In each location the alien light communication device is in a similar spot.
With multiple sites, and the placement overall being quite remote, don't expect this objective to be too difficult to get done early in the match with little hassle.
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How To Place The Alien Light Communication Devices
Now this is the tricky part. The quest specifies 'mountain top', so you would expect the peaks of the mountains right? Wrong. Thanks, Fortnite.
The locations for placing the devices is usually just outside of the camps that have been set up close the the peaks.
Each device location is on the edge of a smaller peak just outside of one of the base camps. They aren't too difficult to spot with the blue silhouette against the white snowy backdrop.
Just walk up to the locations and interact with them to place the device and listen to the oddly calming music that emits from them. Let's hope they enjoy classical music and it doesn't aggravate them...
Once you're done with the quest, why not check out the amazing recreation of The O2 in Creative?