Your search for "MA-ANT-MX" revealed the following:

Cisco Meraki MA-ANT-3-F6 6 Port Narrow Patch Antenna for MR53E and MR46E

SKU: NSB-4086
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
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Cisco Meraki MA-MNT-MR-4 Wall Mounting Plate for MR18 Wireless AP

SKU: NSB-5848
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW HPE Aruba AP-535 JZ337ACM US Wi-Fi 6 802.11ax Int Ant Central Managed WAP

SKU: NSN-7778
Condition: New
Shipping: Overnight Options
Warranty: 365 days

HPE Aruba AP-535 JZ337ACM US Wi-Fi 6 802.11ax Int Ant Central Managed WAP

SKU: NSB-7492
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days