Is SAT grounding possible via a 7x2.5mm² cable?

At my grandmother's house, we installed a satellite dish on the roof. It is not grounded. Installing a new cable would be very difficult. However, there is an unused 7x2.5mm2 power cable available. I could probably use this for grounding and connect it to the masts and the grounding busbar? It’s not according to standards but surely better than nothing?

Can someone help here? Thanks

I am not an electrician, but does a satellite dish actually need to be grounded? It has no direct connection to the power grid and the worst that can break is the LNB, which costs a few €.

but does a satellite dish actually have to be grounded

Definitely yes. Otherwise, you will bring lightning into the house via the TV cabling. However, I cannot contribute to the actual question. In our case, the satellite dish is grounded via a 16mm² protective conductor. 7x2.5mm² should actually not be inferior to that. However, the professional might still say "no, because it is not standards-compliant". You would probably have to ask a "practitioner" rather than a "standards stickler".

The expert here on this question would be

Definitely yes. Otherwise, the lightning would get into the house through the TV cabling. However, I cannot contribute to the actual question. With us, the satellite dish is grounded via a 16mm² protective conductor. 7x2.5mm² should actually not be inferior to that. However, the professional might still say "no, because it is not standard compliant." You would probably have to ask a "practitioner" rather than a "standards enthusiast."

It is dangerous to make such statements! Two times slowly crashing into a wall doesn’t hurt as much as once fast. Conductor resistance, surface, etc. are massively different. Then there are funny effects with surface currents, solid material vs. stranded wire, etc. Which of the materials is better or even suitable, I would not decide based on "should." Standards have a purpose and are mostly scientifically founded. Especially with such very well describable physical things. And I would certainly not ask a practitioner here. Because I hope no practitioner builds so many houses that he experiences a relevant number of lightning strikes in his professional life. The statement "it has always worked so far" is therefore probably only due to the fact that he hasn’t had a strike in any of his installations yet.