I should clarify - that's in the basement with just a few walls and still underground (in an inner-ring suburb). We also don't have a cordless phone, satellite, or other typical 2.4 Ghz devices that cause much interference (besides a few older wifi devices on the 802.11g network).

If you're in a more urban environment, apartment buildings, or have plaster or other types of walls (mine are drywall and studs), you're luck will go down considerably.