lol, this is the band used for any wireless gadget that you can find. Your counter measures are going to disrupt someones outdoor thermometer, wireless stereo transmitter, thinkgeek computer gadget, garage door, home security, flower pot telemetry, etc. Now it moved a bit to blutooth but you need to license that shit so its not always the best business decision.
i think the counter measure you need is a Valiumâ„¢
read this because the only thing you are gonna do is probobly start a feud
https://www.data-alliance.net/433mhz-antennas/most RF gadgets actually come with a 433Mhz antenna (like SDR) because its ubiquitous. BTW if you don't know already, ALOT of companies are getting into IOT now to offer smart functionality in devices. You will see this more and more.
I see nothing wrong with trying to identify where a signal is coming from (this is learning about RF), but don't 'countermeasure' them like a idiot peon that thinks they found a witch
also the frequency output on that thing is probobly shit. We tested something like that and it was giving us random baloney, a MDO gave a clear answer.
also
https://www.reddit.com/r/RTLSDR/comments/10417sz/will_43392mhz_and_423mhz_interfere_with_each_other/smart meters too.
You'll have to answer to the electric and power company.
I think your problem probobly falls under the realm of 'hicks talking shit'. The threat is when you walk on to your property line in slippers with a shotgun and a bottle when the cops show up. Every time there I have seen something with the property line there is someone holding a beverage on the other side talking nonsense