[TowerTalk] New Tower installation

[Dave]

I have just put up a Rohn 25G.  My question is, and I haven't researched the
archives due to the  interest of time before the snow blows. Can I use the
3/4" x 4' screw anchors with 6" blade to secure the tower with out using
cement.  If I just screw them in all the way straight down, no angle,  will
they hold, or do I need to angle them at 50 deg. as stated in the Rohn
spec's.
I would like some feedback on this way of doing it.  These things are
suppose to hold trailers down.  Are they reliable enough for the tower.
Wind load on the only beam is 6.9 sq. ft. with a 10' 2" mast.
 
Thanks, Dave