A lot of people will say have to have two on back but I have one and I'm find with it!
Radar Roy says it covers a good 18-19 inches to left of sensor and 18-19 inches to right of it which in my mind is most of back of my car.
I just came back from driving on 81N from PA to New York & I was hit in back and I got plenty of notice & time to slow down. Is two better I would say yes but one is FINE too!






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