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I don't have any fancy antenna equipment, but if it helps I do have an RTL-SDR and Airspy R2 SDR. I've been able to see the frequency spectrum that my antenna is putting out in the VHF/UHF bands. I was hoping to use that to see if I could tune things.
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A spectrum analyzer can be very useful. It will allow you to check the SNR.
The RTL-SDR.COM V3 dongle doesn't show a whole channel with the SDR# (SDRsharp) software, but it will show part of a channel, the pilot, and the adjacent noise floor, which is sufficient to estimate the SNR.
To show more than one channel, there is free open-source software for the dongle, but it isn't ready to use; you have to assemble it in a folder from GitHub.
I like the Airspy R2 with the Spectrum Spy software.
The dB scale is only relative, not absolute.