> but you need to hunt down EMI sources, before you can properly use it.
Do you have any recommendations for doing this? I have some source that interferes every 11 seconds for a second or so. It causes packet loss with my wifi (2.5 and 5GHz), and makes my bluetooth game controllers really frustrating to use, since input are missed every time it does it. I assume it's in the microwave range.
I'm familiar with RF test equipment, and I've thought about renting a spectrum analyzer, but I assume there's maybe some cheaper way.
You can also use high-Q antennae, if you have a frequency of interest. For instance, on HF (shortwave) a tunable small loop antenna does a whole lot better than a wire antenna in a high-random noise environment. You may still end up chasing down various bogies, but a lot of them can be blocked with the directionality of the antenna or the filtering properties of the antenna (higher Q antennas are more narrowband).
The limited availability of KiwiSDR's have made it crazy high priced. I've been trying to get one for a year now but they're up to like $600 on aliexpress. KiwiSDR2 has been announced, but that's a ways off from being sold.
WebSDR on other hardware is a better alternative-ish.
I have one, but you need to hunt down EMI sources, before you can properly use it.