Some CB Base Antennas that are popular are the IMAX 2000 and Antron 99 verticals, however other models are made and work well include the Maco V 5/8th wave groundplane, and the Spectrum 1600 to name a few.

CB Base Antennas are on the 11 meter band (approx 35.6 feet).  Therefore the antennas need to be a fraction or multiple of this length, to be considered a resonant antennas.  Generally, 5/8 to up to .64 of 1 wavelength is about the highest low angle gain, under the 1 wavelenth threshold.  Although unpractical, it is possible to make antennas "several" wavelengths long, and this is often done with Ham Antennas.

Some quality 5/8th wave (or .64 wavelength) antennas are the:

• Imax 2000
• Maco V58
• Shakespeare Big Stick
• Penetrator 500

The IMAX 2000 is currently the most popular, but many other high quality brands also work very well.