Model IO-45HD Manual (4.2 foot) roof tower
Model IO-610HD Manual (6 foot)roof tower
Model IO-810HD Manual (8 foot) roof tower
Model IO-815HD Manual (8 foot) roof tower
“Tower and Antenna Wind Loading as a Function of Height”, Frank Javanty W9JCC, QEX July/August 2001, pp 23-33
EIA/TIA-222-G Explained
How to Strengthen your Roof with Collar Ties
The Mathmatics of Rafter and Collar Ties
Calculations for the IO-810 roof tower.
A detailed description of the specifications of each tower is available in a link below the tower. The Tower Kits include all of the aluminum structural parts and the assembly bolts, washers and nuts.