Best tint for 2004 A4 Dolphin Gray

Not sure if you guys reply to customers who are looking for the best tint or not.

I just purchased a Dolphin Gray 2004 Audi A4. I'm going to get it tinted. I heard that metal tint will reduce the AM radio reception in my car. What is the best alternative?

A local shop near me has Madico Charcoal, which he says is non metal. Will this last? Is it really non-metal? I checked Madico's web-site, but they only talk about "Charcool" being non-metal, not Charcoal.

Radio reception already sucks on this car, so I don't really want to make it worse, unless the I'm really asking for trouble by going with a non-metal film.

Solargard makes a non-metallized True Grey. Still has a lifetime warranty against colorchange. Good looking film too.

The tint shops near me have Madico, 3M and Johnson. One of them said they could get Llumar.

I tinted this 2004 S4 Avant with Suntek HP Charcoal 20% on the rear glass, Huper Optik ceramic 30% on the rear quarters, Ceramic 40% on the rear doors and ceramic 50% on the front doors. Looks beautiful to me.