I have been sorting this out for a few years now from information taken off of several different post on BAT-LABS and this what I have.
Moto antennas
You need both the base color and length to properly identify Motorola antennas.
Astro / XTS / and others using the Jedi SMA type
137-174 MHz wide band 203 mm red
136-151 MHz heliflex 195 mm yellow
151-162 MHz heliflex 183 mm black
162-174 MHz heliflex 172 mm blue
380-435 MHz stubby heliflex 88 mm red (early 86 mm units 403-433 MHz)
435-470 MHz stubby heliflex 81 mm green
470-512 MHz stubby heliflex 79 mm black
403-512 MHz wide band 130 mm light grey
700/800 dual band flexible whip 178 mm green
806-870 MHz stubby 1/4 wave 80 mm white
806-870 MHz flexible whip 175 mm red
806-870 MHz elevated feed dipole 200 mm red
896-941 MHz flexible whip 160 mm blue
896-941 MHz elevated feed dipole 200 mm blue
APX series - not known
XTS 4000
136-151 MHz 48 mm
145-166 MHz 43 mm blue
162-174 MHz 38 mm
SABER / MX (paint on end of thread)
136-151MHz 165 mm yellow
151-162MHz black
162-174MHz 152 mm blue
403-435MHz red
435-470MHz green
470-512MHz black