1) Go to store with K band door opener.
2) Connect your RD to your coiled cord, and mount in usual location.
3) Park at edge of parking lot (or the point where the RD is consistently having trouble picking up the signal), with RD pointing towards the door.
4) Notice strength reading on RD. Slowly take RD off mount and stick it out the window, while still pointing towards the radar source. Note new reading.
If reading is the same, your windshield is good. If there is a big difference, your windshield/tint is a problem. You can do this same test to determine if your tint is metallic or not.
Also, you might want to do this test when there isn't many people around in the parking lot. People look at you kinnda funny when you hold a RD out your window...
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