Extremely easy to build if you're use to soldering copper pipe. I believe that ARRL has plans for one somewhere in their home page. Probably the most difficult part is getting the RF connection in place. In fact if I was going to do it again, I'd practice/experiment this part first before I started sweating joint. Performance is great. Mine is three three band config, 2 & 1.5 M & 90cm.
You can also make one from 300 ohn ribbon cable very easily. Perfect for travel. I've used mine from east to west coast.
ARRL's magizine QSL had an article couple years ago of an easier 2 M antenna made from 1.5" aluminum strips (2) and I think it was a 90 cm config on the other. Four aluminum strips with four angles, a hole drilled through them and mounted to a CB type antenna base you can pick up at the truck stop. The ham radio club that made them were in Michigan and seems like had about 4 repeaters they used them on. Super easy, cheap and when I inquired with the author, they had gone through a couple of winters with no problems.
