fading

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Research reported in [33] showed that vehicles induce signal fades that are up to 40 dB, even when they do not traverse the transmitter to receiver path.
In fact, if I venture too far into the Colorado wilderness, I'm likely to get really agitated--the signal fades out and I suddenly can't call anyone
HD signals drop out well before the analog does, so an HD tuner switches to analog if the on-band HD signal fades away and then goes back to HD when the signal improves.
It has an amplifier that noticeably improves cell coverage and, along with the antenna, boosts the signal level and reduces the problem of dropped calls and signal fades.