George, Jeff's boom does look like a good one. Tractor Supply has a boom pole 78" long from the top link and rated to lift 1000#. It weighs 60 pounds and I think the price is $69.99. I've wondered about the range of travel, e.g., how low to the ground will it go and how high will it go. And of course, I assume that lengthening or shortening your top link would affect that measurement; another place a hydraulic top link would be nice.
Bird