A built-in camera. I can't tell V1 encounter stories to non-detector or cheap-detector owners without them immediately dismissing my story as made up.
Today's encounter was the last straw. There's a segment of Silver Bell Rd bordering Auburn Hills that's a very popular speed trap -- wide 4-lane roads with large curves, PSL is 50. If you don't go 60, big escalades and pickups will harass you.
So, I was following traffic flow (read: rabbits) at 65mph when my V1 alerted to 3-bars Ka ahead, then went silent. With any other detector, I woudl've thought some Cobra user was nearby. However, I decided to be cautious. I moved to the far right lane and while making the lane changes, got another 3-bar Ka blip that lasted 5 seconds or so. At this point, I strongly suspected IO ahead, so I slowed down to 53 or so gradually, as the alert pattern repeats itself every 10 or so seconds for the next half mile. Then, as I round a curve, the V1 lit up full-strength on Ka and I saw the left-lane SUV nose-dive brake a few seconds later. As the road straightens out, I see a slicktop charger with lights on, pulling over the SUV already. The V1's rear antenna continued picking up the pair over 2 miles across 3 shopping complexes where the bogey counter went up to 7 or 8 at times with X/K-band openers, but never failing to remember to light up that blinking rear arrow for Ka.
What I suspect happened was that the cop was running moving same-lane or oncoming Ka with his front antenna (cops here mostly use Stalker dual antenna), and when he saw the SUV round the curve he blasted with the rear antenna, which would cause the V1's extremely strong signal indication compared to all the other blasts.
So, all in all, I'd estimate the V1 was catching forward-facing IO bursts at 3 to 5 bars from out of visual range around curves, and the rear antenna was catching the antenna he left on for over 2 miles.
Now, I really need to set up a camera in my car to capture these encounters! This kind of Ka performance is mind-blowing!