LibreVNA VS ubertooth

I've been using the open source LibreVNA for the past few months. It's an order of magnitude less expensive than other 6GHz VNAs, but a real step-up from the NanoVNAs. Though it won't have comparable performance specs to a typical setup, It'll probably be just fine for the applications you mentioned.

The 2.4GHz spectrum is shared between Bluetooth and WiFi 802.11b/g. A few years ago, I was doing some work using an Ubertooth-One scanner (https://greatscottgadgets.com/ubertoothone/). It was showing the traffic on different channels.

My wife stuck a burrito to warm up in the microwave a room away (30-40 ft). This was with a brand-name model, so presumably properly shielded, etc.

Nope. The entire spectrum just went white with noise on all channels.

Once the microwave cycle ended, it still took a good 15-30 seconds before the airwaves calmed down and went back to normal traffic.

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I think these are : Proxmark3 HackRF One USB RUBBER DUCKY Flipper Zero WIFI PINEAPPLE PWNAGOTCHI SHARK JACK the usb one looks like Ubertooth One not sure Raspberry pi with a touch screen lock picking kit

Using something like this[0].

[0]: https://greatscottgadgets.com/ubertoothone/

That CC2500 may work for your needs. You might want to check out the Ubertooth One which is built around the CC2400, and can capture 1MHz bandwidth FSK signals.