[Milsurplus] Antenna name, info?

[KD7JYK DM09]

I have a conical antenna, appears to have been designed for aircraft, it is:

Empire
Antenna Cone
Model CO-205
Singer, The Singer Company Metrics Devision
Bridgeport, Conn., U.S.A.

I am guessing, based on a similar antenna that I have a frequency range of 
roughly 300-600 MHz, but I am unable to find info on this model or photos of 
similar antennas on the web.

Anyone have any info?

Kurt