I wonder how well this would work. Wouldn't the Faraday cage need to be tuned to the wavelength of the cellular radio? Someone elsewhere suggested putting the

I wonder how well this would work. Wouldn't the Faraday cage need to be tuned to the wavelength of the cellular radio? Someone elsewhere suggested putting the car in a cargo container, but I don't think that works either. I was on a large ferry recently, my phone worked below deck several inclusive distance units away from the coast.