I have used 12" wall mounts below the eaves with a mast sticking above the roof. In my case I installed three 2x6 supports horizontally between the vertical 2x4's used in the gable end roof truss. I used 1/2" plywood screwed to both the 2x6's and the 2x4's to hold the 2x6's in place. The wall brackets were mounted into the 2x6's using 2 1/2" long lag bolts.
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