We’ve had cheap, tiny USB oscilloscope and logic analyzers for well over a decade. They’re all over Amazon and Aliexpress.

The cool thing about this one is that it’s open source and well documented.

There are a lot of downsides: The front end has poor input protection and the entire unit is much less resilient, calibrated, and trustworthy than what you’d use in the Navy.

Have you tried using a NanoVNA? Those things are amazing. For << $100, you get a device that can measure SWR, attenuation, impedance, generate Smith charts, from about 10 Khz to 4 Ghz+ to a reasonable extent.

Oh, and RTLsdr dongles are fantastic deals too, when coupled with the GNU Radio project.