My Airport Extreme Signal output graph is jumping up and down like crazy, is this normal??

The Airport Extreme base station is the 5th Gen, and is about a week old.
All clients and the airport itself aren't moving.
Is this normal? To me it looks really strange. The graph should be smooth line if nothing is moving right?

The biggest problem I see that you will have is that both the 2.4 & especially the 5 GHz radio signals will have a difficult time penetrating through the concrete walls ... so I would suspect only the wireless clients in the same room as the AEBSn will be successful with a wireless connection with sufficient bandwidth.
If one of your network clients is a Mac laptop, you should use iStumbler again to get the signal and noise reading of your AEBSn in both of the rooms that are on the other side of the concrete walls from the AEBSn.
Better still; use iStumbler's Inspector feature (select Edit > Inspector from iStumbler's menu) to determine the Signal-to-Noise Ratio (SNR) at these locations. Within the Inspector, note the values for "signal" & "noise" at these locations. Start with your laptop near the AEBSn, note the readings, and then, choose the locations where where you have each of your wireless clients.
SNR is the signal level (in dBm) minus the noise level (in dBm). For example, a signal level of -53dBm measured near an access point and typical noise level of -90dBm yields a SNR of 37dB, a healthy value for wireless LANs.
SNR Guideline
40dB+ SNR = Excellent signal
25dB to 40dB SNR = Very good signal
15dB to 25dB SNR = Low signal
10dB to 15dB SNR = Very low signal
5dB to 10dB SNR = No signal 
If the SNR is 25dB+ at each of these locations, then you should be getting reasonable performance for the wireless client from the AEBSn. If less, try relocating either the AEBSn or the wireless clients until they are within a 25dB SNR range.

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