I'm in the same boat. No knob and tune, and all the plaster has been removed as well (thankfully by someone else in the houses lifetime).
I've also DIY installed 3 mini split units in the house -- the last one being an AC / DC unit that directly gets powered via 4 panels on the roof during the sunny moments of the day.
Built a new addition 3-4 years back. It's far better insulated than the main structure, but the wood stove and heat pump combo keeps winter mostly at bay.
It's basically passive radar using the wifi bands as the reflection AFAIK. It doesn't seem to be about the active state of devices, but the deflections in known points. It's creepy.
I know it's a shamed topic around here, or it seems like it, however I find the Bitcoin mining aspect of chewing up these "needed to be wasted" loads the one true positive of it (Bitcoin).
Yeah, it's changed from its seeming origins. Yes it's number go up! But being able to turn that extra juice, that NEEDS to go somewhere back into 'cash' is certainly on my list of positives.
Obviously, it's lower than batteries and lower or on par with storing as sand/thermal (I guess location and season dependant on this one).
One other perk, now that I rant about thermal, is being able to absorb this extra energy, do some calculations and then provide (location/season) heat. Seems like the calculation aspect is the 3 birds one stone, to me.
Perhaps https://www.sdrpp.org/ would work for you? Just throwing it out there -- I've learned that my few SDRplay devices def. require a lot more pieces and parts on my linux machines than any of the other SDR devices that I own.
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