code: def strip_mcs(self, idx):
          
          mcs = collections.namedtuple(
              'mcs', ['known', 'index', 'have_bw', 'have_mcs', 'have_gi',
                      'have_format', 'have_fec', 'have_stbc', 'have_ness',
                      'ness_bit1'])
  
          idx = Radiotap.align(idx, 1)
          known, flags, index = struct.unpack_from('<BBB', self._rtap, idx)
          bits = format(flags, '032b')[::-1]
  
          mcs.known = known               # Known MCS information
          mcs.index = index               # MCS index
          mcs.have_bw = int(bits[0])      # Bandwidth
          mcs.have_mcs = int(bits[1])     # MCS
          mcs.have_gi = int(bits[2])      # Guard Interval
          mcs.have_format = int(bits[3])  # Format
          mcs.have_fec = int(bits[4])     # FEC(Forward Error Correction) type
          mcs.have_stbc = int(bits[5])    # Space Time Block Coding
          mcs.have_ness = int(bits[6])    # Number of Extension Spatial Streams
          mcs.ness_bit1 = int(bits[7])    # Number of Extension Spatial Streams bit 1
          return idx + 3, mcs
docs: strip(3 byte) radiotap.mcs which contains 802.11n bandwidth,
          mcs(modulation and coding scheme) and stbc(space time block coding)
          information.
          :idx: int
          :return: int
              idx
          :return: collections.namedtuple