The front bumper is just about the worst place to mount an antenna of any type. The grounding there is poor, and there are usually sites on the vehicle with a good body ground and more height. A place with more metal up high to reflect signal off is usually good as well.
Remember, everything else being equal, height is king. Electrically, the center of your roof is king. Generally though, compromises get made and a lip mount on a hatch is pretty darn good.
For most uses , whether 2m/440 or 2m only, whip antennas are the toughest. and electrically they are pretty good too. Plus, they are cheap! I am partial to the Larsen antennas but there are other brands out there too.
I have not really followed the radio threads here, but I'll bet someone has published Lip mount pictures before.
1997 FZJ80 Desert traveller
1989 FJ62-OME, 33s, OME suspension, H55f
1984 FJ60-SOA, H41, toybox, locked, 37s, Rubicon edition
1971 FJ40-SOA, FJ60 axles, 85 2F, it abides