After some long thought and calculating wind loading, I’ve added another set of guys. This time to each of the opposing corners of the roof as noted in my last post.

Here’s the math…

Wind pressure at 80mph: 16.4 lbs. / sq ft.

MA5B wind load rating: 3.2 sq. ft.

3.2 (ma5b) * 16.4 (80mph wind) = 52.48 (Antenna wind load).

52.48 (Antenna wind load) * 10ft (height of mast) = 524.8 ft lb. moment.

35 (Ballast weight per block) * 8 (number of blocks) = 280 lbs of pressure at base.

With the above math that indicated I was approximately 244 ft lbs. over the maximum of my base.

By adding an additional 4 guys at a lower angle than my original ones, I’m only asking for 61 lbs of force from each of my guy points on the roof. The math is a little crude and could contain some errors, but “best operating/engineering practice” and a good shoulder nudge from me on the mast indicates it’ll hold up to “normal” NE Pennsylvania wind forces.