I'm looking for a recommendation for an external antenna to use with my

Yaesu VX-7R handheld.

This antenna would spend most of its life on a bicycle (on a rear rack
behind the seat), which is how I commute to/from work. However, I'd
like to be able to use it occasionally on a car/truck so I'm thinking a

magnetic base would be the most flexible.

Ideally it would cover all of the VX-7R's bands, or at least the
6M/2M/70CM bands and it would have a cable with an SMA connector at the

end.

Ideally it would be something like Diamond's CR627B antenna
(http://www.rfparts.com/diamond/cr627b.html) but without needing a
triplexor and with a magnet mount.

Now I realize that such a thing might not exist which is why I'm open
to suggestions that I drop the 6M band requirement which would lose me
the grounding requirement which would lose me the restriction against
magnet mount.

Ideas?

greg