As you can see, I have the actual V1 unit mounted above the rear-view mirror. I've also put it in a similar location in the sentra that you can see in front of my VX. I haven't done an A/B test with a radar gun (although a cop lives immediately across the street from me and often leaves his radar gun on and pointed directly up my driveway) but I have not noticed any obvious reduction in rearward sensitivity for either real radar or falses from automatic doors at the grocery store and such, despite the much larger rear window in the sentra.