To me it is a case of do you want to spend $250.00 or $500.00 for tint. I've always used a metallic tint on every car without issue. Cars with antenna's in the back glass and cars with the antenna's on the roofs. Never have I had an issue with either one.
I'll stick to the cheaper route until I do notice a problem.
Metallic Window Film – Problem?Today’s cars come fully equipped with so many gadgets that it’s almost possible for them to drive themselves. Newer vehicles often feature complex electronics systems, such as satellite radio that provides customized entertainment and the latest traffic conditions, GPS navigation to get the driver where he wants to go when he’s lost, keyless entry systems provide safe entrance to the vehicle, remote start allows the driver to start their vehicle from a distance so by the time they get in their vehicles it may be cool or warm already, tire pressure sensors tell drivers when their tires get too low, and radar detectors designed to avoid speeding tickets.
To work properly, these devices rely on antennas that receive signals from things as far away as the heavens (satellites) or as closeby as the next parking space (a remote control for keyless entry). Sometimes those antennas are on the roof, but other times they’re in the rear window. And, that’s where the problem comes in for Metallic Window Films. When metallized films are installed over those antennas, they interfere with the signals. That means a driver may not be able to enjoy the high technological features of his vehicle.
Ceramic Window Film – Solution?Metal films provide exceptional heat rejection and are highly durable, but they cause interference with rear window electronic systems. Dyed films are non-conductive, but they don’t last as long and they don’t provide the best heat rejection. Ceramic films provide the best of both worlds. Ceramic films also offer better visibility by reducing the reflective qualities of metallized window film while increasing the visible light transmission. This gives you a lighter film with higher heat rejection.
For those of you that are interested, here are some state laws regarding window tinting. Texas looks to be accurate. Can't say for sure their list is current.
http://www.tintcenter.com/laws
John