How can I get a cable thru the firewall on a chevy pickup>

Look for a rubber grommet somewhere on the firewall that leads into the cabin or you can run it along side something that already goes through the firewall.

Worse comes to worse, you drill your own hole through the firewall.

I thought there may be an easy way to get a coax cable thru the firewall. I see the other thru fittings but I didn't want to disturb the rubber.