Looking at ZKH's mount I'd like to type a warning here.......
IN Michigan, and I suspect other states, bridges are normally at least 16' above the pavement when you drive under one.. Any bridge lower will have a clearance signe, IE: 15'6"
13'
11'
The bottom of the traffic signal is likewise 16' above the road (or more, but usually not much more)
If your antenna sticks up 18' it's gonna suffer damage..
My roof is 11' as I recall (Measured it) might be 12, 12.5 feet to top of rig, unloaded
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