If you own an X5 you know that the internal WiFi antenna that comes with the box, if there is one, has dismal performance. By accident I have discovered, while using my headphones with the X5 and streaming video, that the WiFi bitrate I get in my lounge goes from ~6mbps to ~60bmbps when the headphones are connected. The X5 is about 10m from the access point, and around a corner. The bitrates I refer to above are those reported by Android system settings, but actual speeds in applications tell the same story. The headphones have a long cable, I'd say 2.5m. I have only noted this a few times but I do believe that the headphone cable acts as an antenna. I guess some level of shielding is just not there in the X5: I can also occasionally hear cellphone-like buzzing in my ears when viewing streamed video while using the headphones.