Comparison : Item # AT-2000, SLH10 Standard Stub Loaded Helix (SLH) Antenna
Item # AT-2200, SLH-12A Medium Gain Stub Loaded Helix (SLH) Antenna
Item # AT-2400, SLH-12B Medium Gain Stub Loaded Helix (SLH) Antenna
Item # AT-2500, SLH13 Medium and High Gain Stub Loaded Helix (SLH) Antenna
Item # AT-3400, 3300 to 3900 Megahertz (MHz) Circular Polarized Antenna