def strip_tx_attenuation(self, idx):
idx = Radiotap.align(idx, <NUM_LIT:2>)<EOL>tx_attenuation, = struct.unpack_from('<STR_LIT>', self._rtap, idx)<EOL>return idx + <NUM_LIT:2>, tx_attenuation<EOL>
strip(1 byte) tx_attenuation
        :idx: int
        :return: int
            idx
        :return: int