The one thing all these solutions have in common is the requirement of a fairly sophisticated device to receive the signals, such as a PC, laptop or smartphone. This wasn't an issue for me, though, as I already had my Media Center PC present and running pretty much all the time in my living area, and I rarely travel anywhere without a laptop.
However, if this still smacks of technology for technology's sake, there are much simpler solutions that can still avoid interference. If all you want is to see and hear your baby from another room without any interference, consider one of the low-price security cameras from electronics stores that, for about Rs. 1,682, will get you something thatlooks like a webcam with a long audio and composite video cable you simply connect to a TV set. If you're using your PC for monitoring, we'd love to hear any tips about how you're getting on.