Just remove the original upper section of your A-99 base and screw-in the 3/8x24 threaded base of the FIRE-UP 99 antenna. The patented Firestik bare-hands tunable tip gives you even more freedom to fine-tune your antenna to a specific frequency and further expands the overall tuning range of your A99 base.
NOTE:
The FS-99 is IS NOT a stand-alone CB antenna. The frequency of the FS-99 is 32.700MHz. However, when used on the A99, the overall frequency of the combined sections brings the primary operational frequency to approximately 27.185MHz.