I have internet through Time Warner, but I use my own modem and my own wifi router. Iv'e started noticing some available wifi networks in my area that start with the letters "tl" followed by some numbers (which I've discovered are actually the last numbers and letters of a MAC address to some device I cannot identify) I'm watching one network in particular. I thought it was a neighbor's wifi, except that every time I change the my wireless channel, it changes to that same channel as well. However, if I turn off my router, my modem, or both, the mystery network remains. I'm stumped. I'm pretty sure it's being transmitted from my home, but what could it be? I have checked the MAC addresses for my modem, router, and network cards, and none of them match.