in iStat i have seen 6mb and 3mb pop up every so often, generally 2mb, and lows in the 400kb range every so often, but that may be based on certain websites. I'm on a 802.11n/g/b compatible setting. I have mine set to automatic, and i tested at various channels, automatic seems to work fine. it tends to jump to Channel 9 every time.
My Mac Pro is about... 20 feet from the Time Capsule. And i have about 8 networks in my area that pop up, all below 50% signal strength, and all were either channel 1 or 6 according to iStumbler.
My Mac Pro is about... 20 feet from the Time Capsule. And i have about 8 networks in my area that pop up, all below 50% signal strength, and all were either channel 1 or 6 according to iStumbler.