Scott;

What you have there is a CB antenna. You can tell from the loading coil
at the top of the stick. A VHF marine antenna will not have any coils as
the 48" length is sufficent for a half wave vertical dipole.

Dave WD9BDZ

Scott Downey wrote:
I have a white fiberglass top loaded antenna that is 48 inches long.

At the bottom of the antenna where the metal part screws onto the L bracket
aluminum mounting base is imprinted 'wondershaft'.

It is toploaded because the top 15 inches is thicker and I assume there is a
coil of wire under the white fiberglass covering.
It uses a Pl259 coax connector mount on the base for the coax cable.

Does anyone know if this is a marine CB antenna or would it be a marine VHF
antenna or how to tell the difference?
Thanks for any info.