Yah, I've done it with TV and home audio antennas which is where I got the idea. I just didn't know if there were any particulars about car antennas... So I did a search on Radio Shack's web site and I came across this little item. It looks like it might be just what I need. Looks like I'm stopping by Radio Shack on my way home tonight. It's got a built in capacitor which is probably needed due to the impedence issues you mentioned.

So maybe it's possible after all...

-Tony
MkII #554