As a Valentine One user, I am hook on arrows, so I'd recommend the r7. Check out the Radar Form at https://www.rdforum.org/ if you don't get all the info. you want here.
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I have been harassed for having one once in Wyoming. The office told me that having one showed intent, I replied that it is a tool and I have a hammer, but I didn't intend on building a house. Of course that was after they wrote me up 6 over. My preference would be to get a built-in store or install it in a discreet spot that isn't so obvious.
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If you can tint your windows then they won't see you discreetly take the detector down if they pull you over, I did that a couple times years ago and never got called out
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