diff --git a/src/georinex/obs3.py b/src/georinex/obs3.py
index 7b371dc..5889ad8 100644
--- a/src/georinex/obs3.py
+++ b/src/georinex/obs3.py
@@ -155,6 +155,9 @@ def rinexobs3(
     if time_offset:
         data.attrs["time_offset"] = time_offset
 
+    if "antenna" in hdr.keys():
+        data.attrs["antenna"] = hdr["antenna"]
+
     if "RCV CLOCK OFFS APPL" in hdr.keys():
         try:
             data.attrs["receiver_clock_offset_applied"] = int(hdr["RCV CLOCK OFFS APPL"])
@@ -363,6 +366,12 @@ def obsheader3(
 
         fields = {k: fields[k] for k in use if k in fields}
 
+    # %% Antenna phase center (optional)
+    try:
+        hdr["antenna"] = [float(j) for j in hdr["ANTENNA: DELTA H/E/N"].split()]
+    except (KeyError, ValueError):
+        pass
+
     # perhaps this could be done more efficiently, but it's probably low impact on overall program.
     # simple set and frozenset operations do NOT preserve order, which would completely mess up reading!
     sysind: dict[str, T.Any] = {}
diff --git a/src/georinex/tests/test_obs3.py b/src/georinex/tests/test_obs3.py
index 4f969cc..bdc8a97 100755
--- a/src/georinex/tests/test_obs3.py
+++ b/src/georinex/tests/test_obs3.py
@@ -208,3 +208,11 @@ def tests_all_indicators():
 def test_time_system(fn, tname):
     obs = gr.load(ir.files(f"{__package__}.data") / fn)
     assert obs.attrs["time_system"] == tname
+
+
+@pytest.mark.parametrize("fname", ["CEBR00ESP_R_20182000000_01D_30S_MO.crx.gz"])
+def test_antenna_offset(fname):
+    fn = ir.files(f"{__package__}.data") / fname
+    obs = gr.load(fn, use=["G"], tlim=['2018-07-19T01:00', '2018-07-19T01:05'] )
+
+    assert obs.antenna == [0.178, 0.0, 0.0]