Antenna installation on a ‘63 Valiant

My V200 wagon did not come originally with a radio. I’ve installed a working one, and there was an antenna delete grommet in the fender. I’ve removed that, but I don’t see where to route the antenna lead. Do I have to drill a hole? Why would there be a fender grommet, but no other plug to remove? I hope I’m missing something- here’s a shot through the hole.

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