Comet CQ5M antenna mount with cable and quick-disconnect.

From product description:

Low-profile, quick disconnect trunk mount. 16' 9" of low loss cable and
18" of RG-188 teflon cable. Comes with gold plated PL connector.
The antenna and connector easily disengages from the trunk mount base
with the release of a lever for storage in your trunk for theft
protection.

Bought new, never used. Asking $40