Why does a car tv box need two tuners two antennas?

Why does a car tv box need two tuners two antennas?

With two tuners, two antennae, you can install the antenna on the left and right sides of your car. when the car is running fast, once one antenna missed the tv signal, another antenna will be as a backup, to ensure that tv picture is stable and has no mosaic.

If your local tv signal is not strong, maybe you should consider 4 tuners 4 antennae digital tv module.