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Your TV can see through walls
:— This is a spectogram of the signal from a local TV station: Walking between the receiver and TV station causes a slight disturbance to the signal, but it's nothing to write home about: For this capture, I moved the antenna a few centimeters: This is selective fading: The direct signal is being canceled out by a strong reflection. Because the phase of the reflection depends on frequency, this effect is not uniform over the whole signal.
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