diff --git a/gprMax/cmds_multiuse.py b/gprMax/cmds_multiuse.py
index 385f6f92..e7689a0d 100644
--- a/gprMax/cmds_multiuse.py
+++ b/gprMax/cmds_multiuse.py
@@ -871,7 +871,7 @@ class Rx(UserObjectMulti):
 
         try:
             r.ID = self.kwargs["id"]
-            outputs = list(self.kwargs["outputs"])
+            outputs = self.kwargs["outputs"]
         except KeyError:
             # If no ID or outputs are specified, use default
             r.ID = f"{r.__class__.__name__}({str(r.xcoord)},{str(r.ycoord)},{str(r.zcoord)})"
diff --git a/toolboxes/GPRAntennaModels/GSSI.py b/toolboxes/GPRAntennaModels/GSSI.py
index d6d8a8ee..e21b700a 100644
--- a/toolboxes/GPRAntennaModels/GSSI.py
+++ b/toolboxes/GPRAntennaModels/GSSI.py
@@ -405,7 +405,7 @@ def antenna_like_GSSI_1500(x, y, z, resolution=0.001, **kwargs):
                 p1=(tx[0] - 0.059, tx[1], tx[2]), p2=(tx[0] - 0.059, tx[1] + dy, tx[2]), material_id="rxres"
             )
             scene_objects.append(e1)
-        r1 = gprMax.Rx(p1=(tx[0] - 0.059, tx[1], tx[2]), id="rxbowtie", outputs="Ey")
+        r1 = gprMax.Rx(p1=(tx[0] - 0.059, tx[1], tx[2]), id="rxbowtie", outputs=["Ey"])
         scene_objects.append(r1)
 
     elif resolution == 0.002:
@@ -414,7 +414,7 @@ def antenna_like_GSSI_1500(x, y, z, resolution=0.001, **kwargs):
                 p1=(tx[0] - 0.060, tx[1], tx[2]), p2=(tx[0] - 0.060, tx[1] + dy, tx[2]), material_id="rxres"
             )
             scene_objects.append(e1)
-        r1 = gprMax.Rx(p1=(tx[0] - 0.060, tx[1], tx[2]), id="rxbowtie", outputs="Ey")
+        r1 = gprMax.Rx(p1=(tx[0] - 0.060, tx[1], tx[2]), id="rxbowtie", outputs=["Ey"])
         scene_objects.append(r1)
 
     return scene_objects
@@ -804,7 +804,7 @@ def antenna_like_GSSI_400(x, y, z, resolution=0.002, **kwargs):
         )
         scene_objects.extend((w2, tl2))
     else:
-        r1 = gprMax.Rx(p1=(tx[0] + 0.162, tx[1], tx[2]), id="rxbowtie", outputs="Ey")
+        r1 = gprMax.Rx(p1=(tx[0] + 0.162, tx[1], tx[2]), id="rxbowtie", outputs=["Ey"])
         scene_objects.append(r1)
 
     # Geometry views
diff --git a/toolboxes/GPRAntennaModels/MALA.py b/toolboxes/GPRAntennaModels/MALA.py
index 937ec7b0..cbee5f06 100644
--- a/toolboxes/GPRAntennaModels/MALA.py
+++ b/toolboxes/GPRAntennaModels/MALA.py
@@ -649,7 +649,7 @@ def antenna_like_MALA_1200(x, y, z, resolution=0.001, **kwargs):
     scene_objects.append(vs1)
 
     # Output point - receiver bowtie
-    r1 = gprMax.Rx(p1=(tx[0] + 0.076, tx[1], tx[2]), id="rxbowtie", outputs="Ey")
+    r1 = gprMax.Rx(p1=(tx[0] + 0.076, tx[1], tx[2]), id="rxbowtie", outputs=["Ey"])
     scene_objects.append(r1)
 
     # Geometry views