John and others:
Take a look at the pac-12 portable vertical. from pacific antenna;
http://www.pacificantenna.com
Also, you can home brew this from the article at
http://www.njqrp.org/pac-12/index.html
I built one last year, and it works great. Mine was all home brew, and
only needed some help with the machining and one solder joint.
I modified the design to use one coil and a wander lead. However, I may go
back to separate coils for ruggedness and ease of setup.
Hope this helps.