Yeah as Moiz said, it's actually quite simple. Find that wire, cut it, and splice in a switch. Could take you 15 minutes if you aren't too worried about the quality of your connections or position of the switch.
As a few people have said, if you antenna comes up all the time like mine, your first port of call actually should be to check your head-unit wiring. If you can't resolve the issue that way, give the above a go.
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