Trying to enter the height of the antenna in the config page. But the height is not accepted as it is 6 meters below sea level. Unfortunately many area’s in the Netherlands are below sea level so this must be the same for other feeders. How can this be solved, because -6 meters is being reported as an invalid value.
Where are you located - lat & lon?
According to your profile you are located in an area near Nes aan de Amstel that is higher than -3 meters. Nieuwerkerk aan den IJssel is the lowest place in the Netherlands at 6.67 meters below sea level and is a far away from your location.
To get to the FA configuration page click the * on the right side of the orange band. If it isn’t there you need to log into your account. On the configuration page click the Edit Height link. While you are on the configuration page you should check the accuracy of the other info.