I'm sure the kids will love this! Wi-Fi Theremin sounds great.

You hit the nail on the head! That's precisely the motivation.

Having two kids myself, I've thought of turning it into a game: blindfolded hide-and-seek where the pitch of the Wi-Fi Theremin tells the seeker how close they are to the 'signal disruption' of the other person. It's essentially a real-time sonar game!