Since I don't have a big enough drill bit I had to grind it to size. So, I made an appropriate sized template to draw the hole size on the plate. I carefully measured the distance to the mounting holes so that it would be properly placed.
Hole drawn (slightly large so that I have some wiggle room).
My grinding tool.
And it's done! Lots of vacuuming of aluminum shards was necessary....
I knew there would be lots of debris under the plate (there's a space) I slid several pieces of duct tape under it to get it out. Worked perfectly. When I mount the antenna I will use washers to bridge the gap of the mounting bolts and it will be mounted nice and tight.
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