Has anyone with more experience looked at the Seeed Studio RF Explorer series of Spectrum Analyzers?? I have one and on the surface looks like it does the job, especially when connected to a PC.? I did use it to verify that there are marginal issues with harmonics on the uBitx, not quite the -43 db required (more like -41 to -42 on my board).
It is low cost ($178) for the WSUB1G+ on Amazon. And it can be portable.