another guy said I should play little bit with the settings in the edit window of the tv card.
There I found the setting "Prefered network provider" and I set it to "DVBT".
Welcome to the forum!
You can edit the tuner settings from the tuner list. There is information in our wiki -->here<-- (see "edit card properties" and "preferred network provider"). In other words:
1. Open TV Server configuration.
2. Expand the "TV Servers" node on the left.
3. Select your TV Server in the left hand tree.
4. Select the DVB-T tuner from the tuner list.
5. Click the edit button.
6. Change the "preferred network provider" setting to DVBT.