Any idea on what the wavelength is on these?

I attempted to contact K40 about the wavelength of their k40bcmax antenna after seeing one for sale locally, no answer from them & the seller doesn't know what 1/4, 1/2, etc means.

Nothing on the packaging nor anywhere I looked online.

Any idea as to what the answer is? Also anyone have experience with these, any good?

 

Any idea what length whip attachment might bring it closer to 1/2 wave?

 

That's my current whip (102"), kinda wondering how compact I can get things to reduce mast mangling strikes with the largest wavelength possible.

I made a home brew mag mount constructed from four fishing magnets & T shape of 1" steel pipe to clamp onto, that only dropped once (untrimmed monster limb struck mid-whip).
Thankfully had enough weight/clamp force to grab the cab side almost immediately rather than a drop & dangle or worse.

I believe each magnet claimed something like 150-250lbs of force....it took some real oomph to relocate but pretty sure those numbers were still wayyy over the actual clamp force being harbor freight purchases.