Traditional TV (antenna to receive the signal) is how the transmission, why does not card, while the digital TV instead of sometimes stuck!

Digital signals can get stuck this is due to the power or quality of the signal being too low.

In the analog TV era, the signal is bad usually cause snowflake points, diagonal lines, horizontal bars and so on.

And the digital TV signal is either very clear quality, or there will be a mosaic, a card, a card phenomenon,

This is due to the digital TV signal in the process of transmission of a large number of error code, resulting in the receiver can not be fully restored to the correct signal.

Then you need to contact your local cable TV customer service to check the line.