Triband 2M/220/70cm HT Antenna
Extended receive range: 118-160MHz, 250-290MHz,
360-390MHz, 420-470MHz, 820-960MHz.
Gain & Wave:
2M  1.3dBi 1⁄4 wave
220MHz  1.4dBi 1⁄2 wave
70cm  1.8dBi 5⁄8 wave
Max Power: 10 watts
Length:  11 inches
Connector:  SMA

Although the HT-224 improves the performance of 2M, 220 and 440, it favors 2M and 440 in particular.

Tri-band 6M/2M/70cm
Extended receive range:  80-170MHz, 360-390MHz, 420-470MHz, 820-960MHz.
Gain & Wavelength:           
6M 0dBi top load 1⁄4 wave
2M 0dBi 1⁄4 wave
70cm 3.2dBi 5⁄8 wave
Max Power: 10 watts
Length: 20.5"
Connector: SMA

The MH-510 is designed to provide a definite improvement compared to the stock triband antenna.

Triband 6M/2M/70cm HT Antenna
Gain and Wavelength: 0dBi   1/4 wave
Max Power: 10 watts
Length:  4.5"
Connector:  SMA
Construction:  Rubber sleeve over hard plastic core

The MH-511 is designed not to dramatically improve performance but to be a convenient alternative to the stock triband antenna.

Dual-band 2M/70cm HT Antenna
Extended receive range:  118-160MHz, 250-290MHz,
360-390MHz, 420-470MHz, 820-960MHz
Gain:
146MHz  1.2dBi
446MHz  1.7dBi
900MHz  3.4dBi
VSWR: 2:1 or less
Max Power: 10 watts
Length: 9.75"
Connector: SMA