It should be noted this is a commercial off the shelf acquisition
https://www.getfpv.com/commercial-industry-drones/ndaa-compliant/heaviside-moth-ruggedized-tactical-spectrum-analyzer.html

These spectrum analyzers simply display RF activity on a given frequency, without further processing they do not detect or identify drones. They do nothing to solve fiber optic or AI drones. Spectrum analyzers generally provide information overload to undertrained troops.

For these to be effective, basics of radio theory and drone RF must be instructed at all levels of the U.S. Army.