It's not original, it can be welded and repaired,if done right, only you would ever know it was their, but it will mean you would have to repaint the sail. People in the 70's and 80's, who wanted to communicate with other people on the road would mount C.B. antennas ( before cell phones), that may be why they cut a hole their, I have seen people drill holes in the roof!
Sometimes easy=stupid.
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