Rather than doing that, I'd stay with the tri-pod, but reinforce it... Use 3/8" (or heavier) threaded rod to go through the roof deck itself, and extend down enough to go through a 2x4 which is placed across several roof rafters. The 2x4 will cause any strain on the tower to be distributed across several roof rafters rather than at a single point. Do this for all legs of the tower.
I used a quad beam antenna and rotor mounted on a three-leg tower on the roof of my dad's garage 30+ years ago - back in my 11-meter days - and I never lost the antenna or tower due to high winds. I drilled through the single rafter that the one leg mounted above to allow for the cross-beam. The other two legs fell between rafters... Mark - N9WYS -----Original Message----- From: Repeater-Builder@yahoogroups.com On Behalf Of Preston Moore Anyone have any suggestions on an antenna for GMRS repeater use. This repeater will be at my residence and the antenna will be mounted on a 5-foot tripod on the roof. I have a DB-420 and was successful in getting it mounted, but I felt it was just slightly too heavy. I was afraid it would come down in a strong wind. Can I use just the top section of the DB-420 without changing the phasing harness? If not, can someone please suggest a decent antenna? Antenna tripod mount is at about the 40-foot level and height really does not matter. I have a $500 antenna budget. Thanks Preston Moore
