T bone. The Smart radios are among the very cheapest radios that will still make noise in a car. An add on RF Amp will not help much, and may make it even worse.
Two routes to go. 1. Buy a good after market radio. 2. Try having a new radio wiring harness installed.
The harness will include a new RF amp and will be covered by warranty. I'm having my harness switched out next week. If the radio is no better. I'll do step 1.

A2Jack.
BTW. Be sure and keep your old radio for resale time. Many buyers insist on an original car.