A lot of car salesman will have you believe that this is the case when in actual fact this is not correct!
Years ago when cars radio aerials were built into the glass, this was an issue.
However, all modern cars (what car salesman are selling) have their aerial on the outside of the car.
Also, cars now come with Bluetooth so this is definetly not a problem anymore!
For the past 30 yrs we have applied metalised film to our personal cars and never had a problem with our radio!
