MT1000 portable antenaes = ID ???

[Satelite]

Hello :
I have 4ct MT1000 portables in the lo band 36 to 42 mhz split.
Three of the MT1000 radios have the same length antenae of aprox
6 7/8 inches long with a black painted bottom.
The other one is aprox 9 inches long with a silver bottom = no paint.
I have compared them to a VHF 150 antenae and the VHF 150 with black paint is about 1 inch shorter than the three at 6 7/8 inches long.
Do i have the right antenaes ?
How do i confirm ?
Thank you
Satelite

[FireCpt809]

The black bottom 6 7/8 is a VHF 151-162 mhz The longer one is most likely a VHF lo 40-50mhz

[DJP126]

The NAB6064 antenna is for all low band MT1000 radios (30 to 50 MHz). Supplied with the antenna is a chart so that you can cut it to the proper length depending on your average frequency. Uncut, it is about 12" long.

[RadioSouth]

The low band is noticeable fatter than the VHF. If you don't have a known band OEM for comparison put up a pic of what you have.