Hi @jeannedip7! Welcome to the MetaGeek community forums. Chanalyzer basically has two data sources: a Wi-Spy DBx, or a Cisco CleanAir AP. It can connect to and record data from one at a time.
Most of our customers end up with both: The Wi-Spy DBx for carrying around and getting the client perspective, and CleanAir for when they need to look at something remotely, or want the AP’s perspective.
The Wi-Spy DBx is a swept-tuned spectrum analyzer, and CleanAir AP’s have a Real-Time FFT (Fast Fourier Transform) spectrum analyzer. You might find that the Cisco AP does a better job at catching very fast transmissions like Bluetooth. My opinion: for the stuff that truly interferes with Wi-Fi, and for measuring channel utilization, both Wi-Spy and CleanAir AP’s do a good job. All of that to say, if you plan on just using Cisco AP’s, you don’t need a Wi-Spy, but it can be nice to have.
I hope that helps!