diff --git a/LCS/PyStationModel/antennafields.py b/LCS/PyStationModel/antennafields.py
index 158acf4f22f057ae64f7a82a9142283472573732..c5ac192d5c294f583cbdf531737b3224bcca0edb 100644
--- a/LCS/PyStationModel/antennafields.py
+++ b/LCS/PyStationModel/antennafields.py
@@ -1,13 +1,13 @@
-def antenna_fields(station: str, antenna_set: str) -> list:
-    """ Return the list of antenna fields for a certain station, for a certain antenna set. """
+def antenna_fields(station: str, antenna_set: str) -> tuple:
+    """ Return the tuple of antenna fields for a certain station, for a certain antenna set. """
 
     if antenna_set in ["HBA_DUAL", "HBA_DUAL_INNER"] and station.startswith("CS"):
-        return [station + "HBA0", station + "HBA1"]
+        return (station + "HBA0", station + "HBA1")
 
     if antenna_set.startswith("LBA"):
-        return [station + "LBA"]
+        return (station + "LBA")
 
     if antenna_set.startswith("HBA"):
-        return [station + "HBA"]
+        return (station + "HBA")
 
     raise ValueError("Cannot parse antennaset name: %s" % antenna_set)