code: def antenna2(self, context):
          
          lrow, urow = MS.uvw_row_extents(context)
          antenna2 = self._manager.ordered_uvw_table.getcol(
              MS.ANTENNA2, startrow=lrow, nrow=urow-lrow)
  
          return antenna2.reshape(context.shape).astype(context.dtype)
docs: antenna2 data source