The documentation for the old Wilson ST-77B crank-up tilt-over tubular tower
(design sold to US Tower as MA series) notes that you can add a single set
of guys to the top (via slip ring) to increase the tower capacity.
The main tower is 68' tall and the mast can extend up to 9 feet above that.
Ratings with NO Guys:
69' 18 sqft @ 50mph
77' 12 sqft @ 50mph
With 4 equally spaced guys at top section:
77' 20 sqft @ 80mph
I am, of course, am running a 40-2CD at 72' and a 10-el log 10' above that
-- with no guys. I've only been scared once that it would blow down.
Best crank-up lessons learned:
1. Mount antennas on alternate sides of the mast so the tower top section
2. It takes far fewer people to remove antennas than to install them.
Rob Hummel (WS1A) <firstname.lastname@example.org>
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Administrative requests: towertalk-REQUEST@contesting.com
Sponsored by Akorn Access, Inc & KM9P