FYI, A buddy installed a G6 on his repeater here locally atop a 5,000 ft + Mountain. They went back up about 30 days later and could not believe what condition it was in. I kept hearing stories over the radio about how it looked like it had been up there years. When they took it down, and brought it to one of our club meets, the radials were either broken off or bent, and the antenna did over-all look a but rough for wear. This was after having been subjected to heavy now and ice build up on Mt Wilson. The repeater owner swore by those antennas until he witnessed what effect the snow and ice had on it.
My 2 Cents . . . . Paul Metzger