Not sure how accurate those measurements would be, & there’s some strange things with the DAB+ readings.
DAB signal strength shouldn’t be -48dBuV, if it’s -48 it should be dBm. If it’s dBm, -48 is a very strong signal.
0dBuV is no signal, it’s as low as you can go.
If it’s supposed to be +48dBuV then that’s ok, but it’s very close to the minimum signal strength/cliff edge where you’d be able to tune or listen to anything without it dropping out.
Ideally you’d probably want that figure up over +54dBuV or somewhere around 60dBuV for a solid signal.
The BER of 36? I don’t know what that means, BER is measured with an equation type reading like E-04, which means 4 errors for every 10,000 bits of data.
MER which is Modulation Error Ratio is measured in dB & if that’s what it is then 36 dB MER is excellent signal quality, (MER is similar to signal to noise ratio).
The FM, 97.3 strength of 26dBuV is low, too low to pick it up on a home or portable receiver, but car radios are much more sensitive, so not surprising you picked it up, but it wouldn’t be very good reception. Not sure why the 4KHz offset is there though?
96.3 at 16dBuV is extremely low strength, it’s not surprising you couldn’t get anything there.
Generally for FM radio, 40dBuV & above is stereo car radio reception, 30-40dBuV is mono car radio reception, below 30dBuV is pushing the limits for any radio reception, unless you have a good quality sensitive car radio tuner.
For a home or portable radio generally, 66dBuV & above is protected (from interference) stereo reception, 54-66dBuV is mono reception, & anything below that can’t be guaranteed protected from interference nor guaranteed any sort of quality reception.