Thanks for all the replies. Looking at a Comet CA-GMRS antenna, 42 inches tall. The overhang on the roof is 2 ft. and the facia board is a 2 x 6.
Of course will make it strong enough for high winds (have seen 115 mph). I was concerned about RF radiation from the elec power line interfering with
the antenna signal reception and output. Is that an issue if too close to the line?