This page of the guide to Dying Light 2 contains the exact location of all antennas and towers where you can install the GRE detectors. These devices point to inhibitor crates scattered within the range of the antennas. However, they don't show standalone inhibitors, e.g. those that you can find after clearing the subway.
You will find more about how to unlock the GRE detector on the page Inhibitor detector - how to use?
- Ways to unlock
- Saint Joseph Medical Radio Relay
- Historical Communications Tower
- Newfound Land Military Relay
- South Loop Radio Tower
- North Loop Radio Tower
Ways to unlock
Each such location requires a lot of climbing skills. Aside from extensive stamina, you will also need a grappling hook.
When climbing, look for ladders that you can drop down. This way, if you suddenly die, you can climb the ladder at any time and save yourself a few minutes of climbing.
Look around carefully. As you climb, you have to grab onto all kinds of vertical pipes, horizontal elements, ropes or masts. Any places you can grab will be marked in yellow.
Once you climb to the very top, you have to activate the tower. This will activate a relay that will start showing all available GRE crates in the area.
Saint Joseph Medical Radio Relay
Affected territory: Horseshoe, Trinity, Houndfield, Quarry End
This radio relay is in the northeast part of Houndfield, in the hospital from the beginning of the game.
Historical Communications Tower
Affected territory: Downtown, New Dawn Park
You will find this tower on the northwest side of Downtown. There is a subway entrance, a windmill and an airdrop in the area. The latter is easy to get to by jumping from the activated tower.
Newfound Land Military Relay
Region: Newfound Land
Affected territory: Newfound Lost Lands, Flooded Area
You can find the Newfound Land military relay "outside" the map. You can access the area where the inhibitor is hidden on your own or in the course of Wall of Valor: Lost Transmission side quest.
South Loop Radio Tower
Region: Lower Dam Ayre
Territory covered: Lower Dam Ayre, Saint Paul Isle
You can discover this radio tower shortly after getting the GRE detector. You can easily fly to the roof using the hang-glider. Thanks to its range, it covers the entire area of Lower Dam Ayre.
North Loop Radio Tower
Region: The Wharf
Affected territory: The Wharf, Muddy Grounds
You will come across this radio tower while exploring the western part of The Wharf. Compared to other towers, this one isn't tall. You can get onto the building more easily by using the hang-glider.