There may be a new take on antenna design.

The Cross field antenna is said to have as much as 5db gain over a
traditional quarter wave. It has a bandwidth of 30% of the operating
frequency. It does this all at a height of only 3% of a wavelength.

If made into a CB antenna it would be about one foot tall.


http://www.crossedfieldantenna.com/

http://www.antennex.com/preview/cfa/cfa.htm