@ivo I noticed that if I ground the station in the ground wire of the electrical supply system I receive a lot of noise every time an electrical apliance turns on or when I plug-in my cellphone's charger in any electrical socket. Now, I grounded the Blitzstation in a safety handrail. Please note that in Blitzortung's documentation (Project Description) https://www.blitzortung.org/en/cover_your_area.php page 55, paragraph 4.3.1.9 says: "... Note that the ground of the system should never be connected to the ground wire of the electrical supply system."