Are you defiantly looking through the station listings fully. At the top of the listings there are category headings that open up when you enter them. Such as "BBC National" or something similar.
Another aspect, depending on where you live, is the dab signal strength/quality.
Most VW vehicles have an amplified "shark fin", or "bee sting" roof mounted aerial.
Our vans have a rubbish wing mirror mounted aeriel(s), I think the reason for this is multi-storey carparks, carpark barriers. ferries (you are charged more above 2m) etc etc, where less than 2metres height is important, and most of our vans are with 20mm/30mm of that height. A good reason to spend £5k on an air-ride system
, which drops 100mm or so.
I think our vans wing mirror aerials work better on the contient where they use the superior "DAB+" format as opposed to our first generation "DAB"
There are posts on this forum of people who have changed their aerials and got much much better station reception.
In Car DAB Radio Aerials > Digital Antennae Aerials for DAB Car Radios
Above is some information on various alternatives
dabonwheels.co.uk : Kinetic DRA-6005 GPS FM-AM DAB car aerial
This is about 40mm high with the besetting removed, it may work for your vehicle and keep you at <2m. So long as you remember to remove it?????????
Please let us know how you get on