A multiband OFDM_UWB transmitting and receiving apparatus is provided in Low-IF configuration to solve problems attributed to a direct-conversion transmitting and receiving apparatus. A wireless system in which high modulation rate packets are prioritized over low rate packets. The first ferromagnetic film has an effective magnetic thickness of about 2 nm or less. In some embodiments, one portion selected from the body interface portion and the exit portion is receivable in another portion selected from the body interface portion and the exit portion, with the flow-through portion positioned between the one portion and the another portion.