Jim (MM0BQI) - there's a useful article by G3WUX in RadCom June 1999 and an excellent article by G3JMG in March 1970 RadCom. That's going back a bit so let me know if you want me to scan and attach it. I've always known it as the 'Gin Pole' method, as do both the above authors. Thought the term 'Falling Derrick' was an americanism. 73 Tom G3OLB