K40 SF CB Antenna Superflex

K40 SF CB Antenna Superflex

The K40 Superflex CB antenna is an extremely flexible antenna with the capability of bending 180 degrees without damage. This K40 CB antenna is perfect for rough trails or just protection against low hanging obstacles and wind load.
$ 24.95
Color :
  • Category: CB Antennas, Fiberglass CB Antennas

The K40 SF CB antenna was designed to be highly flexible under non-ideal situations.  The lightweight 1/4" fiberglass core is not only durable, but extremely strong.  The SF series CB antenna also has a high quality copper winding for maximum performance wrapped in either black or white military spec sheathing.  The K40 SF CB antenna is available in black or white and in lengths of 2', 3' & 4'.  SWR tuning is a breeze with the SF's tunable tip design.  This K40 CB antenna can be mounted in any 3/8" x 24 threaded stud mount such as the Firestik K4A.


Using any 3/8" x 24 threaded stud mount, the K40 SF CB antenna installs easily.  Remember after installation, make sure you tune your CB antenna using an SWR meter.  Tuning the antenna is the most important part of the installation to maximize the performance of the K40 SF.

What's In The Box

K40 SF CB Antenna
Allen Wrench 


K40 offers a 5 year limited warranty on the SF CB antenna.  This does not cover damages caused by abuse, misuse, negligence (i.e. hitting overhead objects, improper installation) are considered to be avoidable circumstances.  FTL Distributing offers a full 2 year warranty on the K40 SF.  To obtain warranty information on your product just send an email to support@ftldist.com


The range of the K40 SF will vary greatly depending on surroundings, weather, etc.  You can normally expect these ranges:

2' SF200  1-2 Miles
3' SF300  2-3 Miles
4' SF400  3-4 Miles

Sizes & Colors

The K40 SF CB antenna comes in 3 lengths (2', 3' & 4') and 2 colors including Black and White


The K40 SF CB antenna has a tuneable tip for easy SWR tuning.  If the SWR is greater on Channel 40 than on Channel 1, then you have an electrically long antenna and need to make it smaller by screwing in the tip or removing it (if necessary).  If the SWR is greater on Channel 1 than on Channel 40, then you have a electrically short antenna and need to unscrew the tip (to make it longer) or you can add a spring or quick disconnect to make it longer.

Power Handling

2' SF200 - 500 Watts
3' SF300 - 1000 Watts
4' SF400 - 1500 Watts