On Wednesday, 17 April 2019 09:43:45 UTC+1, Brian Gaff wrote:
Stereo fm is far worse s/n to Mono FM. Many DAB stations are in mono
whereas they are stereo on FM R4 extra and Smooth etc.

I think that DAB has three 'grades': mono, 'joint stereo' and 'full stereo'. AFAIK only radio 3 is in full stereo (at least some of the time).

In my expereice FM stereo is a only slightly more noisy than FM mono, provided the signal strength is good.

Robert