I followed the instruction of Melibokus and it worked out very well for me
To avoid issues with DVB-T2-stick I did lots of researches, to find out which one is available (affordable) and which one is supported by Libreelec. Finally I purchased a Geniatech T230C (~30 €) which worked out of the box with Wrxtasy's Media Build Edition.
As I connected a 2.5" HD-Drive and a DVD/Blu Ray Drive I have to use an external powered USB-hub. I experimented with direct connection to Odroid but it did not work.
Thanks for this really helpful and very comprehensive instruction
Fasterix