Not that. Just that unlike analogue TV signals, which can be so riddled by interference that all one can see is a snowy picture (but you CAN see a show!), Digital TV either has good signal strength or too little (or too much) - it's called the 'Cliff face' effect - that too much interference just kills the signal entirely.

At my house, when some cars drive by, they kill the signal almost entirely - and that is when they drive past the REAR pf the (highly directional) Yagi .... sometimes I can notice interference for several days, then it just stops.