As much as a ripoff Illinois is for taxes and fees, the vanity antique plates are an exception. You pay for a vanity plate, and every 4 years when you renew there is no extra charge for the vanity plate. Regular license plates you pay extra every year when you renew if you have vanity plates. I've had this plate on my '70 383 4 barrel Challenger since 1997, paid $75 extra for RTSTUF (R/T Stuff) when I first got the plates, and every 4 years get a antique plate renewal bill for $45.
A couple years back when I got my '71 Challenger, I ordered vanity plates "V CODE" for it. It is up to $125 now for the vanity plate, but I'll still only pay $45 every 4 years to renew it.