You are a good antenna and the impedance of the scope is high. Put a resistor from scope tip to ground, say 20k, and see what you read.
Without a ground, your scope is also "floating." There are both advantages and disadvantages to that and numerous discussions about it on various forums. Some people run their scopes from a transformer to ensure it is not attached to the supply ground.
Is your neutral grounded at the supply to the building, as it is in the US, or is it separate all the way back to the supplier?
I'm glad that I'm not at least a bad antenna
. I put the resistor and the waveform is gone you can see the attached picture.
As regarding the grounding, the wire coming from Utility Pole to the building it is only active and neutral, but there is a thick wire going from top of pole to the ground, so I think it is somehow grounded. But I'm not sure.
Would need to see the pictures from the oscilloscope when the timebase is decreased and the noise is lower. The picture you posted looked completely normal.
I am not sure if "increasing" the timebase means faster or slower but at faster timebase speeds, the low frequency content of the signal is cutoff so the noise is lower. A triggered 50 Hz signal at 10us/div looks like a sloped line.
By increasing, I mean increasing the value of Time/Div or somehow slowing the scope, I have attached the pictures.
Anyway thanks for the answers and I really appreciate the time and effort. To be honest I have used analog scopes before but didn't have such an issue. It's making me crazy.