I bought an STi Driver 2 weeks ago and so far am disappointed with its KA range. I already sold my RX65 Pro, which was awesome! Most of the LEO's in my area use constant on KA 34.7 and 35.5. I don't pick up a signal until I have visually seen the car moving my direction in the oncoming lanes. I called Bel and sent it back today, they said that my KA antenna may be bad. It had revision A4M9. Hope they fix it!