Here you go:
https://documentation.meraki.com/MR/Other_Topics/Frequently_Asked_Questions_regarding_Cisco_Meraki_A...
What are the Models of Outdoor Antennas?
MA-ANT-20 Meraki 4dBi/7dBi Dual-Band Omni Antennas, set of 2
MA-ANT-21 Meraki 5 GHz MIMO 13 dBi Sector Antenna
MA-ANT-23 Meraki 2.4 GHz MIMO 11dBi Sector Antenna
MA-ANT-25 Meraki Dual-Band 8dBi/6.5dBi Patch Antenna, set of 2 (if using with 4x4:4 APs)
MA-ANT-27 Meraki Dual-Band 9dBi/12dBi Sector Antenna, set of 2 (if using with 4x4:4 APs)
AIR-ANT2513P4M-N Cisco Aironet Four-Port Dual-Band Polarization-Diverse Array Antenna (Stadiums)
Darren OConnor | doconnor@resalire.co.uk
https://www.linkedin.com/in/darrenoconnor/
I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.