Co-location receiver desensing

Can an SM’s or BHS’s Spectrum Analyzer be used to identify high signal levels that have the potential to desense the unit when operational?

Or, in a desensed environment, will the the Spectrum Analyzer simply show all frequencies pegged high , and not give you any clue as to the specific frequency causing the problem?

we note high- high (red) causing desens, but a few meg away less than red probably won’t cause much trouble if you are only a mile or two from the sm to the ap