Again from Sat-Online Switzerland 🇨🇭 and below the antenna description in there own words

K40 Randynator-2 Flex TNC 72cm CB Handheld Antenna

The K40-Randynator2 with TNC connection is the first 5/8 Lambda Helix antenna with SWR tunable spotlight for CB handheld radios and an extension of the very popular K40 SF200B. With a length of 72cm, it beats in performance every well-known CB radio antenna for portable handheld radios in the 27MHz CB radio range.

For example, if you want to “cheaply” your QSO partners with an Albrecht HyFlex 27 antenna, you have a clear advantage with this antenna.
The high-quality spotlight is made of fiberglass and the SWR can be adjusted by extending or shortening the end spotlight by means of the supplied hexagonal key. Since each handheld radio with its own mass has a different counterweight, a SWR of 1:12 can certainly be set here. If you do not have a SWR meter available, you can pull out the radiator about 2 cm and thus get an average value.

Adjustable SWR on the spiral radiator:

The exclusive K40 tuning spotlight simplifies the adaptation of the antenna to your system. To fine-tune the SWR with a SWR meter, move the tuning spotlight up or down in small steps. If the SWR on channel 1 is lower than the SWR of channel 40, the tuming radiator at the antenna end should be moved down. By the house, the SWR is set to < 1:2. Since each handheld radio with its own mass has a different counterweight, a SWR of 1:12 can certainly be set here. Especially if, for example, the optional clip CB counterweight is used (see Accessories tab), the SWR can be readjusted again. The counterweight clip can again make up a good 1-2 S-steps, but then the end of the flagpole is possible with the tuning of a CB handheld radio antenna.

Conclusion of this high-quality K40 spiral antenna with flexible fiberglass spotlight and TNC connection: The excess length of 72cm takes a little getting used to, but if you can live with it, you can reach unusual over-ranges with this antenna. It should be noted that the antenna for a mobile phone has a bit of weight, so a horizontal application should be dispensed with and the handheld radio should only be operated vertically, otherwise great forces act on the antenna coupling.

It is suitable for the following CB handheld radios:

• President Randy II
• President Randy III
• DNT Micro AS
• DNT Micro FS
• Lafayette Urano
• Stabo SH 8000
• Stabo XH 9006e
• Team Pico 8012
• K-PO Panther
• Team Maxi 40.. series
• Other CB radios with TNC connection

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