diff --git a/scos_actions/calibration/tests/test_differential_calibration.py b/scos_actions/calibration/tests/test_differential_calibration.py
index 5c9c80ca..0f156dac 100644
--- a/scos_actions/calibration/tests/test_differential_calibration.py
+++ b/scos_actions/calibration/tests/test_differential_calibration.py
@@ -16,15 +16,30 @@ def setup_differential_calibration_file(self, tmp_path: Path):
             "calibration_reference": "antenna input",
             "calibration_data": {3555e6: 11.5},
         }
+        dict_to_json_multiple_antenna = {
+            "calibration_parameters": ["rf_path", "frequency"],
+            "calibration_reference": "antenna input",
+            "calibration_data": {
+                "antenna1": {3555e6: 11.5},
+                "antenna2": {3555e6: 21.5},
+            }
+        }
         self.valid_file_path = tmp_path / "sample_diff_cal.json"
+        self.valid_file_path_multiple_antenna = tmp_path / "sample_diff_cal_multiple_antenna.json"
         self.invalid_file_path = tmp_path / "sample_diff_cal_invalid.json"
 
         self.sample_diff_cal = DifferentialCalibration(
             file_path=self.valid_file_path, **dict_to_json
         )
+        self.sample_diff_cal_multiple_antenna = DifferentialCalibration(
+            file_path=self.valid_file_path_multiple_antenna, **dict_to_json_multiple_antenna
+        )
 
         with open(self.valid_file_path, "w") as f:
             f.write(json.dumps(dict_to_json))
+        
+        with open(self.valid_file_path_multiple_antenna, "w") as f:
+            f.write(json.dumps(dict_to_json_multiple_antenna))
 
         dict_to_json.pop("calibration_reference", None)
 
@@ -35,6 +50,8 @@ def test_from_json(self):
         """Check from_json functionality with valid and invalid dummy data."""
         diff_cal = DifferentialCalibration.from_json(self.valid_file_path)
         assert diff_cal == self.sample_diff_cal
+        diff_cal_multiple_antenna = DifferentialCalibration.from_json(self.valid_file_path_multiple_antenna)
+        assert diff_cal_multiple_antenna == self.sample_diff_cal_multiple_antenna
         with pytest.raises(Exception):
             _ = DifferentialCalibration.from_json(self.invalid_file_path)