•Standard 3/8" x 24 thread scanner antenna

I have read articles about using a preexisting CB antenna mount for a scanner antenna. I have been unable to actually find the proper all band scanner antenna that will screw into the existing mount. The mount is on top on an RV so I am looking to find an antenna that will just screw right in. Thanks for any help in this matter.

MOBILE SCANNER ANTENNAS
https://www.amazon.com/Firestik-MSM4-B-Monitor-Scanner-Antenna/dp/B005AULSTW

Thanks