This was found among some old ham stuff and is believed to have been used on 2 meters.
The vertical elements are 17 1/2" long and the connector on the bottom is a standard SO-239.
Antenna (left) and Connector (right)
(See test results below pics.)
Edited to add Test Results: I mounted the antenna to a small mounting bracket; just basically something to hold it but provided no ground plane. Then a ~20' length of RG-58 to an SWR meter and a 3' pigtail to my HT.
I got an SWR of 1.5:1 on 146.52Mhz and 1.2:1 on 446.000Mhz.
I also got a good, clear signal report on a repeater on 443.525Mhz that's about 11 miles away. The antenna was inside, leaning against my couch.
Edited again to add: There was a comment about impedance matching being done in the mount. There is not. Here is the mount disassembled.