I've always had pretty good luck with a universal style from Pep-Boys. Mount it under the bow, parallel to the glass.
In my Lavey, I just mounted it horizontal, behind the dash.
Never had a real problem with reception. Picks up "The Knack" just fine!!!! On a good day, Rock 107 from Vegas gets through.
Good luck! PM me if you want a pic of how I did it.