K40 Whip Antennas are made of the finest quality materials to stand up to the most rugged conditions while delivering maximum power transfer. And you can use your K40 Whip Antenna with complete confidence, because we guarantee it for five full years.
With its 180° whip action capability, the principle advantage of the K40 Superflex Whip is its ability to withstand extreme shock obstructions
without breakage. In two, three, four, and 41/2 foot lengths.

Adjustable tuning whip
The exclusive K40 tuning whip simplifies matching the antenna to your system. To fine tune the VSWR with a VSWR meter, move the whip up or down in 1/8″ increments.

Determining which way to move whip
If Channel 1 VSWR is higher than Channel 40 VSWR – the whip should be moved upward.

If Channel 1 VSWR is lower then Channel 40 VSWR – the whip should be moved downward.

4-1/2 Foot model SF500 discontinued

Heavy duty construction allows for 180 degrees whip action without breaking.
Patented tuning sleeve simplifies matching your system.
Tuned matching coil.
Copper magnet wire.
Standard 3/8″, 24-thread chrome-plated hardened brass ferrule.