Here is my recording of a baby room monitor using a software defined radio. It was recorded from inside my living room using my discone antenna, Airspy, and SDR# (SDRSharp). Video and audio were captured with Daum Potplayer at a true 16×9 resolution of 848 by 480 pixels.
I thought by now everyone using baby room monitors would have moved away from 49 megahertz analog technology. Reception is noisy because of a somewhat weak signal and humming sound, possibly a fan blowing on the microphone. Maybe that fan was upsetting the baby. Also note, I neglected to show the waterfall display on the video itself, and the tuning was off by .016. My fault.
Notice the waveform for the selected signal (49.830 megahertz) is more pointy, the humming noise has stopped.