Why digital TV signals break up?

Related questions

1. Is a sine wave digital or analog?
2. Does tin foil increase TV signal?
3. What TV channels are UHF?
4. What channels do you get with clear TV?
5. Why did they switch from analog to digital?
6. Why is digital more reliable than analog?
7. Do records really sound better?
8. What are some examples of analog signals?
9. Has analog TV been switched off?
10. What is RF in and RF out?

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