K40 whip keeps snapping.

K-40 makes a fiberglass antenna. There is one that has a smaller diameter than a fire stick and it will take a beating. Had it on a Cascadia running from SLC to Denver for a couple of years and it never broke from Wyoming winds. Had to take it off because of some microburst in MO, it whipped around so much the metal tip broke out the upper bunk window glass.

I've been running thicker fiberglass antenna now but they keep breaking at the base. I'd keep an eye out for that smaller diameter K-40, I think it will hold up better.

 

It seems to me that a fiberglass stinger would crack faster from shock load on a rough road than steel would work harden and break from the same load.

 

If you decide to keep using a mag mnt, go with a wilson, k40 antennas are for camper dans.

 

A little wil wilson will out do that k30 and is almost the same price, no comparison.

 

I can't help but wonder if weird/bad metallurgy with the whips might be the culprit. Dumb question, but did you buy replacement whips from the same place and/or maybe around the same time?

I'm thinking maybe a batch or few of whips with inferior steel may have gotten out on the market. Seen it happen with guns, before. S&W has been known to have widespread metalurgical issues that caused easy, excess rusting of slides, as well as broken/cracked slides on their M&P line of semi-auto hanguns in the past. I guess it could happen with antenna whips, too.

You might try using replacement whips from Wilson antennas or other sources (cut to proper length, of course).

Just an idea.

 

No one uses a spring?