How to Find FM Boxes Fast in Arc Raiders (June 2026) Complete Guide

If you’ve been diving into the intense, extraction-shooter chaos of Arc Raiders, you know that loot is everything. But while everyone rushes for guns and ammo, the smart players are hunting for the specific components that fuel the end-game economy. One item that has caused a massive headache for the community lately is the Frequency Modulation Box.

I spent the last week scouring the map, getting wiped by Arcs, and testing every lead I could find on forums and Discord. I’m writing this guide because finding these boxes shouldn’t feel like a second job. Whether you are looking to craft high-tier comms equipment or complete a specific contract that requires this elusive tech, I’ve got you covered.

In this comprehensive guide, I’ll walk you through exactly where to find Frequency Modulation Boxes in Arc Raiders, the best farming routes for solo and squad players, and how to extract them without losing your progress.

Quick Overview: FM Box Locations

Before we get into the nitty-gritty strategies, here is a quick reference table for the most reliable spawn points I’ve verified.

Location Name	Region	Risk Level	Spawn Probability	Best Time to Loot
Industrial Complex (Factory)	Central Sector	High	Very High	Mid-Game (Quiet)
Radio Relay Hill	Northern Highlands	Medium	High	Early Match
Military Outpost Alpha	Eastern Wastelands	Very High	Medium	Late Match (PvP Active)
Abandoned Bunker 4	Southern Coast	Low	Medium	Anytime
Crashed Convoy	Western Ridge	Medium	High	Early Match

Understanding Frequency Modulation Boxes

First, it’s important to know what you are looking for. Frequency Modulation Boxes (often called FM Boxes by the community) are high-value tech items. They aren’t just sitting on the ground like generic scrap; they are usually found inside specific containers or mounted on walls in tech-heavy areas.

What are they used for? Currently, FM Boxes are primarily used for:

Crafting: Required for high-tier headsets and detection upgrades.
Contracts: Specific “Loot for Tech” side missions from the hub.
Trading: They hold a high value at trading posts, making them great for earning currency.

Because of their value, they usually spawn in “Red Zone” or high-tier loot areas. You won’t find these in the starting coastal areas. You need to gear up before you go hunting.

Top 5 Locations to Find Frequency Modulation Boxes

Based on my research and data aggregation from top sources—including the detailed breakdown over at Stealthy Gaming—here are the absolute best spots to check.

1. The Industrial Complex (The Factory)

This is, hands down, the most consistent spawn location for FM Boxes in 2026. The complex is a maze of conveyor belts, assembly lines, and admin offices.

Where to look: Don’t waste time in the large assembly halls. The FM Boxes spawn almost exclusively in the Control Rooms and Server Rooms. Look for the buildings with the satellite dishes on the roof.
The specific container: You are looking for a “Military Tech Crate.” It’s a heavy, green metallic box with yellow hazard stripes. It requires a bit of time to open, so make sure the area is clear.
Pro Tip: I found that checking the second floor of the main office building yields an FM Box about 60% of the time in my runs.

2. Radio Relay Hill

Located in the Northern Highlands, this spot is thematic for the item you are hunting. It’s a towering radio structure surrounded by smaller bunkers.

Why it works: Because of the theme (communications), the loot table here is heavily weighted toward electronics and frequency modules.
The Spawn: Check the base of the large tower. There is usually a spawn point inside a small generator shed. Additionally, the truck parked near the entrance often has an FM Box in its bed or cargo compartment.
Risk Factor: This area is open. You are exposed to sniper fire from other players and Arc drones. Approach from the tree line to the north to avoid being silhouetted against the sky.

3. Military Outpost Alpha

If you are playing with a squad and want high-risk, high-reward loot, this is the place. Located in the Eastern Wastelands, this outpost is heavily guarded by AI.

The Loot: FM Boxes here are found in the Armory and the Command Center.
Strategy: Do not go in guns blazing unless you have suppressed weapons. The noise attracts Arcs. I recommend clearing the outer perimeter first. The Command Center is on the north side of the base; look for a desk with a radio setup. The FM Box is often found right next to the radio equipment.
Note: This is a hotspot for PvP. Expect a fight on extraction.

4. Abandoned Bunker 4

For the solo player who hates PvP, this is your safe haven. Located on the Southern Coast, it’s a bit of a run, but it’s usually quiet.

The Layout: It’s a small underground bunker.
The Secret: Most players miss the FM Box here because it’s hidden. When you enter the main room, look behind the stacked crates in the corner. There is a small workstation that spawns the box.
Consistency: The spawn rate here isn’t as high as the Factory, but the lack of player interference makes it a great “farming” spot.

5. The Crashed Convoy (Event Spawn)

This is a dynamic location. A convoy of trucks spawns randomly on the Western Ridge at the start of a match.

How to find it: Listen for the engines at the start of the drop. If you hear them, head West.
The Loot: The lead truck and the trailer truck almost always contain high-tier tech. I have found double FM Boxes in a single convoy run before.
Urgency: This is a race. Other squads know about this. You need to be the first one there, loot, and get out.

My Recommended Farming Routes

To maximize your efficiency in June, you shouldn’t just wander. You need a route. Here are two I use religiously.

The “Tech Runner” Route (Solo)

Start: Crashed Convoy (if spawned) -> Next: Radio Relay Hill -> End: Extract at Southern Coast.

This route is designed for speed. You hit the Convoy first for a chance at double loot, then move to the reliable Relay Hill. If things get too hot, you can dip out to the nearby extraction point. It keeps you on the move, which makes you harder to hit.

The “Heavy Lifter” Route (Squad)

Start: Abandoned Bunker 4 (Loot up) -> Next: Industrial Complex (Main Target) -> Next: Military Outpost Alpha -> End: Helicopter Extract at East Pad.

This route requires ammo and meds. You clear the Bunker to warm up, then hit the Factory for the main prize. If your squad is feeling confident, you push to the Military Outpost to try for a third box. This route usually ends in a firefight, so be ready.

Essential Tips for Looting FM Boxes

Finding the location is only half the battle. Getting the item out alive is where the real skill comes in. Here are some tips I’ve learned the hard way.

1. Listen for the “Hum”

FM Boxes, when they are spawned and nearby, emit a very faint, high-pitched electronic hum. If you are in a building like the Factory and you hear this static noise, stop moving. Check your immediate vicinity. It saves you from visually searching every corner.

2. Secure the Perimeter First

Nothing worse than opening a crate and getting headshot by a player camping in the corner, or getting smashed by a Crusher Arc. Before you interact with the crate:

Check the corners.
Look up (snipers love vantage points over tech buildings).
Use your Looter’s Eye (if you have the tier 2 upgrade) to scan for enemies through walls.

3. Inventory Management is Key

FM Boxes are not light. They take up a significant amount of inventory space (usually 2×2 slots). Before you go to these locations, make sure you have space. Drop extra ammo or low-tier meds if you have to. I can’t tell you how many times I’ve found a box and had to stand there deleting scrap just to pick it up. In that time, you are vulnerable.

4. Watch the Timer

High-tier loot spawns are often contested. If you spend 15 minutes looting a single building, the circle (or the “Arc Storm” mechanic) might be closing in, or another squad might be rotating to your position. Get in, get the box, get to extract.

Common Mistakes to Avoid

Through my research of the community and personal experience, here are the top reasons players fail to secure these boxes:

Shooting the Crate: Some players get impatient and shoot the Military Tech Crates open. Don’t do this. You risk destroying the sensitive FM components inside. The item has a durability mechanic; if you blow the crate up, the loot might be destroyed or significantly degraded in value.
Ignoring Verticality: In the Industrial Complex and Military Outpost, the FM Boxes are rarely on the ground floor. If you are running around on the ground level wondering why you can’t find anything, look up. Check catwalks, towers, and roof access points.
Looting During an Arc Attack: If the Arcs start deploying their “Pulse” attack or a Dropship lands, hide. Do not try to loot the box while the alarm is blaring. You cannot move fast enough to open the crate and dodge the lasers.

Community Insights & Updates

I keep a close eye on the Official Arc Raiders Discord and the Subreddit to ensure this information stays current.

As of the June 2026 patch, spawn rates for the Industrial Complex were slightly nerfed to disperse player traffic, but the spawn rate at the Radio Relay Hill was buffed to compensate. Previously, the Relay Hill was considered a “dead” location, but now it is arguably the safest bet for a consistent FM Box.

Additionally, a recent developer tweet hinted at new “Hidden Labs” coming in future updates which will likely contain these boxes in even higher densities. I will update this guide as soon as those drop.

Frequently Asked Questions

Do FM Boxes respawn in the same match?

No. In Arc Raiders, loot is generally instanced per player or spawn once per server wipe. Once a box is taken from a location, it will not respawn there for the duration of that match. You have to move to a new location or extract and queue into a new game.

Can I store FM Boxes in my Stash?

Yes. Once you successfully extract with an FM Box, it goes into your global stash. It is safe there. You can hoard them for future crafting updates or sell them when the market price is high.

What is the best gun to bring when farming FM Boxes?

I recommend an Assault Rifle with a medium-range scope (like the ACR or its in-game equivalent). The locations for FM boxes (Factory, Outpost) usually involve medium-range engagements in tight corridors. A sniper rifle is too clunky indoors, and a shotgun won’t reach the enemies on the catwalks.

Why can’t I find the box at the Factory?

If you are checking the Industrial Complex and coming up empty, you are likely in the wrong building. Make sure you are in the Main Processing Plant, not the side warehouses. Also, check if another player has already looted that server instance. If the doors are open and the crates are empty, you’ve been beaten to the punch.

Are FM Boxes worth the risk of PvP?

Absolutely. The sell price alone is usually enough to buy a full set of Tier 2 armor and a good weapon. If you are confident in your aim or have a good team, the risk-to-reward ratio is one of the best in the game right now.

Final Thoughts

Finding Frequency Modulation Boxes in Arc Raiders is all about knowing the map and playing smart. Don’t just run into the Factory guns blazing. Approach with caution, listen for the hum, and manage your inventory.

The game changes constantly, and the developers love to shake up the loot tables, so make sure you bookmark this page. I update these locations and tips every time a new patch drops in June.

Good luck out there, Raider. Keep your head down and your frequency open.

For more tips on surviving the Arc threat and mastering the economy, check out our full guide on Beginner Tips for Arc Raiders.