Ken, First calculate the wind pressure from the antenna using something like http://www.wikihow.com/Calculate-Wind-Load. A wind load of ~25 lb for that antenna should be very conservative. Then sum the reactions (torques) at the base of the roof mount...the antenna imparts an overturning moment of ~250 ft-lb at the mast base, and so you ballast the mount to compensate for this. The base of the frame is ~3' square, so the center of mass of cinder blocks which you'll use for ballast will be ~1.3' from the base of the mast, suggesting 180 lb of ballast should be enough. Many installations use considerably less ballast and get away with it. I happen to not like my masts to move (much).
The "gotcha" you should be aware of this that your roof must be able to support a ~200 lb load over an area of ~6 sq ft. Of course, if it supports you, it likely will support the loading of this assemblage as well. Best, Dave David Beyerle, P.E. Communications Engineer, IEEE WCP Penn State University 117 University Support Bldg 2 University Park PA 16802 da...@psu.edu 814 863-9432 From: "Mattson, III, Ken V" <kenmatt...@creighton.edu> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Sent: Monday, August 8, 2016 6:30:21 PM Subject: [WIRELESS-LAN] Non penetrating roof mounted WiFi antenna Has anyone roof mounted an AIR-ANT2588P3M-N antenna? Do you have pictures of the installation that you could share? How high did you mount it? How much weight did you put on the base? We plan on putting it as high at 8-10 ft. on something like this: http://www.cableandwireshop.com/non-penetrating-roof-mount-with-166-x-120-mast.html Any gotchas we should be aware of? Thanks for any assistance, Kenneth V. Mattson III Director - Network and Data DoIT Creighton University 402-280-2743 402-981-1140 A password is like a toothbrush: Choose a good one, change it regularly and don't share it. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/ . ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
