I wanted to test the Ka filters with Ka 33.8 to see how well the Radenso Pro M and RCM did and to see if it reduced the range in an off-axis, real-world scenario. Here are my findings. Gun: MPH Bee 36 with a Ka 33.8 antenna mounted in the center of the rear window of a Honda Accord. Course: Curved residential road 2400 feet long. Slight down and uphill. Cruise set at 30 mph. Detectors Tested: Radenso Pro M (US8 fw), Radenso RCM (Current US fw) Pro M Settings: Ka narrow, Ka filter Off/On. Auto-City X8, K4, Ka0. RCM Settings: Ka narrow, Ka filter Off/Normal/High, Auto-City X8, K4, Ka0. Rear antenna off. Runs: Three runs were performed for each detector with each setting (15 total runs). All results were consistent. Results: Both the Pro M and the RCM performed nearly identically with an average detection of 1907 feet for both Ka filter off and on (off / normal for RCM). There was no detectable difference with the Ka filter set to off as compared to having it set on in this real-world scenario (police often shoot in this very spot). This provided around 28 seconds of warning before entering the kill zone at the PSL. Ka Filter High, RCM: When the Ka filter was set to High on the RCM, the detection distance was often the same (1907 feet) but was sometimes 100 to 150' shorter. This is consistent with how the Radenso "High" filters have performed in the past. The distance is not always reduced but is sometimes slightly reduced if the signal is very weak. This image shows the course and the average results. The yellow line represents the various detection zone of the RCM when the Ka filter was set to High. Here is a video of one run so that you can see the course and the warning provided. Here is a bonus video showing the Pro M with a difficult downhill, 90-degree, FF (pointing away from the detector) detection. Ka narrow, Ka filter off. Disclaimer: One set of tests, two detectors, one radar source, low sample rate, test yourself, draw own conclusions, blah, blah, blah.