Which antenna for DAB (+), O-antenna + DAB / splitter or disc antenna?

Quickly described, I would like to install an antenna for DAB + reception in the Suzi or use the original antenna. 1. To the O-antenna, is the DAB + frequencies filtered in the antenna at all suitable or ground? 2. Should a disc antenna be required, how can I best remove the cables from / to the antenna? 3. Is it possible without destruction to remove the plastic covering of the right A-pillar? Because behind it I would like to hide the cables. The Dension DAB + U 7 MCF should be used with the switchbox for DAB / USB media. The and all 3 options, i.e. 2 different disc antennas, with antenna wire or a simple round can with the connection cable to the radio, or as an option an active splitter of the with a 12 V+ cable as well as connection cables for the vehicle antenna as well as the outputs for the DAB+ and FM/AM reception. A short test run with the “Dose” has already worked. However, the components I have not yet in the drive ug fixed, because I want to improve the reception. Therefore I have not attached a disc antenna yet. I am looking forward to your posts!