If it’s the same as the imax 2000, it looks like 10 inches.
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Thanks just got 3 self tapping screws in where the mast meets up.. 1 will be for ground wire maybe.. I dunno..I could always ground at the base too the same way..
I ordered the Channel Master 4" wall mounts for upto 1 1/2" pipe.. figure one at say 3' from the ground and another at 9' up.. about 1' from the roof edge.. that will give me about 2.5' on the wall to help keep giggle and flexing down.. I may add another kit after to do every 2' or so.. $15 per kit can't say no really to prevent tip overs..
That 10" spacing will put my base of the antenna at like 16' 8".. which is better than the 7' I was going to do..