To find the dBm signal strength on the 6620L, scroll through the menu til you get to the icon the is an "i" in a circle. It will say "About Jetpack" under it.
Press the check mark button under the "i". Press the check mark again to go to the next screen, labeled "Internet Status"
The 4th line down will say "Signal" and there will be a number next to it with dBm beside the number.
The lower the number, the stronger the signal. The scale is logrithmic so a small change can make a difference.
i.e. -80 is much better than -99
Hope this helps
