Multanova's are Ka band and are supposably the hardest to detect since there so low power. IIRC there on the higher limit or just out of Ka band because they drift so much (and hence aren't that accurate...), the wideband detectors do really well against them.
I bought a shit cobra detector off ebay and it doesn't go off until your right next to the thing... its probably just your detector being shit. The cheap ones are really a waste of money for use with multanova's.
Dan, lasers are only used as handhelds. The tripod thingo's (multanova's) are all radar still. I'm pretty sure those camera's they stick in wheely bins are radar aswell, lidar makes it harder to get all the lanes at once.
GODTHRILA, I need to come see you to do some testing
Do you have a lidar gun at your work? I have a 'concept' I'm keen to test