Shine Micro tested the four leading omni-directional whip AIS antennas on the market.
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AC Antennas ranked first for performance, ease of installation, and overall quality, followed by Morad and Digital Antenna. Read the complete report on the AC Antenna website.
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VHF Antenna Products for AIS - Omnidirectional

Morad HD159 6dBi AIS VHF antenna Code: ANT-00HD-159 Price: $225.00 Quantity in Basket: none

AC Marine CELmar0-1AIS - AIS VHF Antenna Code: ANT-3CM0-AIS Price: $92.00 Quantity in Basket: none

AC Marine CELmar1-1AIS - Marine AIS VHF Antenna Code: ANT-3CM1-AIS Price: $102.00 Quantity in Basket: none

Smiley Rubber Duck VHF AIS Antenna Code: ANT-5816-TNC Price: $51.50 Quantity in Basket: none

AC Marine CX3 5/8AIS - Marine AIS VHF Antenna Code: ANT-6CX3-58A Price: $285.00 Quantity in Basket: none

Comrod AV51P-4 3dBi 4' Marine AIS VHF Antenna Code: ANT-AV51-P4X Price: $305.00 Quantity in Basket: none

Comrod AV60P-8 6dBi 8' Marine AIS VHF Antenna Code: ANT-AV60-P8X Price: $421.00 Quantity in Basket: none

AC Marine CX4AIS VHF Antenna, Type N connection Code: ANT-CX4V-HFN Price: $164.00 Quantity in Basket: none

AC Marine CX4AIS AIS VHF Antenna - UHF connection Code: ANT-CX4V-HFU Price: $164.00 Quantity in Basket: none