I was all set to purchase a glass mount Diamond antenna for the 2010 Lexus RX350, but then read that metallic window tinting would obscure the coupling. I did some reading, and found that factory tinted windows are most likely a simple dark dye, made into the glass itself, and not metallic in nature. I suppose I could purchase, install, and try the antenna. But, I thought you guys might know of a meter or method to assess the nature of the window tinting from the factory. If not metallic, I am all in on getting an antenna on the back quarter window and ditching the magnet mount which is too high for my garage.