Sure, I agree, which is why I was giving one possible reason why a long cable worked. Nobody should plan to do this, as you are gambling at the margins of anything working, and will in future have loads of problems as cable and connectors degrade, and as other interference arrives.
However the quoted 150m is going to be something like a 30 storey building. Which means a plemium rated cable too. I would go with hybrid fibre unless the distance can be shortened.
Yes, 150m is a very long way, I agree with fibre as the sensible choice.
19 years of broadband, from 1999's ntl:cable modem trial - Live BQM