Over on Bushcraft USA, another member linked to this PDF version of an article from the April 1992 issue of 73 Amateur Radio Today by KA0VFF and N0IMW on how to build a 2M Yagi antenna using aluminum tubing and aluminum arrow shafts for the elements. In the thread discussing it, the poster mentioned being able to check into a repeater on Greens Peak in AZ, from Flagstaff, a distance of about 150 miles using 50 watts. Pretty damn good, IMO. (The thread is here, but I think you need to be registered with BCUSA to view it.)
As a 4-element design, it should have a little more gain than my 3-element Yagi from Arrow Antennas. This will manifest itself only under extreme conditions, however.
With suitable weather sealing, it looks like this design would be a good choice for a permanent mount.
Finally, N5DUX's site has a good collection of ham-related PDFs. It's worth checking out.