Hd quality web rips - how to basics

Can anyone suggest a way to webrip or record HD streams from HD Channels on PC?

I am particulatly interested in getting hold of old 60s and 70s movies which were never released on bluray but seem to have great quality in these HD channels! These upscaled versions are superb but youcannot buy them and the only way seems to be to get a webrip.

Any suggestions? :slight_smile: