My area already has bad reception. When I switched to the JDM short antenna (authentic), my reception got worse. I noticed that my reception is fine in L.A., but sucks in San Diego county. Depending on your location, you may/may not notice a difference.
IMO, JDM antenna>FM lol
I have 50% up front, but I would probably be happier with 35%. When I got a speeding ticket a while ago, the sheriff didn't even add it to the citation. I've found that normally, you won't get pulled over for tinted windows. It will either be added to your ticket or they'll give you the fix-it-ticket instead of what they pulled you over for...but I'm sure that varies by area. I've only been pulled over once in the IS, but when I used to drive a mildly modded civic, I only got cited for tinted windows as an add-on or in place of the real offense (about 3-4x in 15 yrs).