Sounds like fun.

Last year I picked up one of those cheap DVB-T receivers and played around with RTL-SDR a bit.

Was able to pick up a lot of ADS-B traffic (I live near an airport) which was really cool to throw on a map.

Was able to get readings from this little temp/humidity sensor that came with the house (base station is long gone). Also was able to detect when my wireless doorbell button was pressed as well as a few other odd wireless gadgets.

Got readings from every water meter in the area except mine. Either it wasn’t being decodes properly, or almost everyone has a leak. Lol. Still trying to figure that out.

The only thing I failed at was getting a reading from my electric meter. Nothing seems to support it, and online resources came up dry for that model.

I did all that just for fun, but the next step, when I get around to it, is putting together some scripts to reconfigure the radio in a loop to read devices that worked and MQTT the data to HomeAssistant.

This article convinced me to finally buy one