diff --git a/h5_helpers/overwrite_table.py b/h5_helpers/overwrite_table.py
new file mode 100644
index 0000000..9b7c925
--- /dev/null
+++ b/h5_helpers/overwrite_table.py
@@ -0,0 +1,31 @@
+import numpy as np
+import tables
+import sys
+
+def overwrite_table(h5, table, new_arr):
+    """
+    Overwrite h5 source or antenna table
+
+    :param h5: h5parm table
+    :param table: table name (antenna or source)
+    :param new_arr: new values
+    """
+
+    T = tables.open_file(h5, 'r+')
+
+    ss = T.root._f_get_child('sol000')
+    ss._f_get_child(table)._f_remove()
+    if table == 'source':
+        values = np.array(new_arr, dtype=[('name', 'S128'), ('dir', '<f4', (2,))])
+        title = 'Source names and directions'
+    elif table == 'antenna':
+        title = 'Antenna names and positions'
+        values = np.array(new_arr, dtype=[('name', 'S16'), ('position', '<f4', (3,))])
+    else:
+        sys.exit('ERROR: table needs to be source or antenna')
+
+    T.create_table(ss, table, values, title=title)
+
+    T.close()
+
+    return
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