Hi Sam
Havent tried the extention.. but it looks simple to make one.. a small ss bolt of the right thread with a piece of ss rod tack welded in.. will get the welder out...

Mind you, I dont have lots of room left for antennas lol..
Got the 23 foot whip for ssb.. an inverted V dipole.. 3 vhf antennas.. 2 wifi antennas.. Discone.. Quadrifilar Helix for WX sat reception .. 2 gps antenna - so, I s'pose a short whip on the sensor aint gonna be a worry lol.