find frequency utilization

how can we find utilization of frequency? Say We have allocated 5MHZ/20MHZ in 2352, how can we find is it enough or what utilization is going?

Any tools for RF Survey or wifi AP network planning?

“/interface wireless spectral-history 0”

Or use the Dude, it can use this functionality of every RB with a wireless interface, but has multiple graphing modes and nicer graphs.