05 HCH also has a tiny fin/kick up, on back edge of trunk- none of the other civic models have it. that's how we found them in the dealers lot. I use the antenna from the front & the trunk from the rear. I've only seen one civic and one prius so far though.....
I'm too cheap to pay ny dmv for custom plates- it's an annual charge, not one time.
I love the car, but I think people only notice when they're behind me on hills....