From everything I've read 18' coax is what's best to use, but 18' would be a lot just running from behind the dash to the bumper. Do you know if there's enough room to stash the extra cable back there somewhere?

Manny ~ I'm at work now and I can't find the SWR site, but they had meters for around only $15 i think. I'll post a link when I get back home. If you could post a picture of where you went through the firewall it'd be helpful.