Sorry to be unclear - don't really know what I'm talking about. I think it's Mbps. I hold down option and click on the Airport fan icon in the menu bar. It gives me four lines of info, the last of which is "Transmit Rate". This number increases to 145 if I'm in the same room as the TC - which is in my office in the attic. Pretty massive drop however if I'm on the first floor of the house (second floor is okay). In the basement it hovers between 5 and 20. I'm wondering if this sort of drop is normal or if I may have it configured wrong.