The difference is in location of built-in SAW filter chip.
In ANRB Green stick it is before built-in LNA
In FA Blue it is after built-in LNA
In strong RF Noise areas, the FA Dongle’s LNA gets overloaded and makes dongle deaf for weaker signals.
As you have FA Blue filter, add it just before the FA Blue stick, and most likely it’s performance will jump up
Spektrum - How-to Speedily Scan RF Noise in band 24MHz ~ 1800MHz
