Mike, I have paperwork for MT 61A, which was up for about 20 yrs. I used a 24 inch by 72 inch base with 60 inch anchors. It was not anchored to the house. Call or send an e. mail and I will mail a copy of the august 1979 installation instr. Bill, W6YLL 408-3563406 W6yll at aol.com